Astuti, N. (2011). Terapi sehat dengan tertawa [Healthy therapy with laughing]. Jakarta Selatan: Tugu Publisher.
Babatsikou, F., Konsolaki, E., Kouri, M., Zyga, S., & Koutis, C. (2017). Depression in the elderly: a descriptive study of Urban and Semi-Urban Greek population. International Journal of Caring Sciences, 10(3), 1286.
Cha, M. Y., & Hong, H. S. (2015). Effect and path analysis of laughter therapy on serotonin, depression and quality of life in middle-aged women. Journal of Korean Academy of Nursing, 45(2). https://doi.org/10.4040/jkan.2015.45.2.221
Gilliam, L. M. (2019). Magical management in the classroom: Using humor to speak their language. Maryland: Rowman & Littlefield.
Han, J. H., Park, K. M., & Park, H. (2017). Effects of laughter therapy on depression and sleep among patients at long-term care hospitals. Korean Journal of Adult Nursing, 29(5), 560-568. https://doi.org/10.7475/kjan.2017.29.5.560
Kataria, M. (2010). Laugh for no reason (Indonesian version). Jakarta: PT Gramedia Pustaka Utama
Ko, H. J., & Youn, C. H. (2011). Effects of laughter therapy on depression, cognition and sleep among the community‐dwelling elderly. Geriatrics & Gerontology International, 11(3), 267-274. https://doi.org/10.1111/ j.1447-0594.2010.00680.x
Kurnianto, S., Purwaningsih, P., & Nihayati, H. E. (2011). Reduction of depression in elderly with spiritual guidance approach. Jurnal Ners, 6(2), 156-163.
Lee, H.-K., Byeon, D.-H., Park, Y.-S., Kim, J.-S., & Gil, J.-H. (2013). Effects of the laughter therapy on blood pressure, depression and quality of life in rural elderly women. Journal of the Korea Academia-Industrial Cooperation Society, 14(4), 1810-1819. https://doi.org/10.5762/kais.2013.14.4.1810
Lionis, C., & Midlöv, P. (2017). Prevention in the elderly: a necessary priority for general practitioners. European Journal of General Practice, 23(1), 203-208. https://doi.org/10.1080/13814788.2017.1350646
Munro, B. H. (2001). Statistical methods for health care research (4th ed.). Philadelphia: Lippincott Williams & Wilkins.
Nurhusna, N., Oktarina, Y., & Sulistiawan, A. (2018). Pengaruh terapi tertawa terhadap penurunan tekanan darah penderita hipertensi di Puskesmas Olak Kemang Kota Jambi [Effect of laughter therapy in lowering blood pressure among hypertensive patients in Puskesmas Olak Kemang Kota Jambi]. Jurnal Ilmiah Ilmu Terapan Universitas Jambi| JIITUJ, 2(1), 75-81. https://doi.org/10.22437/jiituj.v2i1.5654
Nurwela, T. S., Mahajudin, M. S., & Adiningsih, S. (2017). The effectiveness of laugh therapy to decrease depression level in the elderly at Griya Usila St. Yosep Surabaya and Panti Werdha Bhakti Luhur Sidoarjo. Jurnal Ilmiah Kedokteran Wijaya Kusuma, 4(1), 62-76.
Pae, K. (2017). Perbedaan tingkat depresi pada lansia yang tinggal di Panti Werdha dan yang tinggal di rumah bersama keluarga [Difference of depression level between elderly who are living at nursing home and those who are living at home with family]. Jurnal Ners Lentera, 5(1), 21-32.
Peltzer, K., & Phaswana-Mafuya, N. (2013). Depression and associated factors in older adults in South Africa. Global Health Action, 6(1), 18871. https://doi.org/10.3402/gha.v6i0.18871
Pilania, M., Bairwa, M., Khurana, H., & Kumar, N. (2017). Prevalence and predictors of depression in community-dwelling elderly in rural Haryana, India. Indian Journal of Community Medicine: Official Publication of Indian Association of Preventive & Social Medicine, 42(1), 13. https://doi.org/10.4103/0970-0218.199792
Robinson, L., Melinda Smith, M. A., & Segal, J. (2019). Laughter is the best medicine. Retrieved from https://www.helpguide.org/articles/mental-health/laughter-is-the-best-medicine.htm
Samodara, C., Palandeng, H., & Kallo, V. D. (2015). Pengaruh terapi tertawa terhadap stres psikologi pada lanjut usia di Panti Werdha Kota Manado [Effect of laughing therapy on psychological stress at Panti Werdha of Manado City]. Surakarta, Indonesia: Universitas Sebelas Maret.
Shaw, A. L. (2013). Does laughter therapy improve symptoms of depression among the elderly population. (Dissertation). Philadelphia: College of Osteopathic Medicine.
Sihombing, B., & Fahila, R. (2016). Depresi pada lansia [Depression in elderly]. Universitas Sumatera Utara. Sumatera Utara. Retrieved from http://repository.usu.ac.id/bitstream/handle/123456789/63313/021%20.pdf?sequence=1&isAllowed=y
Soejono, C. H., Probosuseno, & Sari, N. K. (2009). Depresi pada usia lanjut [Depression in elderly]. In A. W Sudoyo, B Setiyohadi, I Alwi, M Simadibrata, & S Setiati (Eds.), Buku ajar ilmu penyakit dalam [Textbooks in internal medicine] (5th ed.). Jakarta: Pusat Penerbitan Ilmu Penyakit Dalam Fakultas Kedokteran Universitas Indonesia.
Taamu, T., Nurjannah, N., Bau, A. S., & Banudi, L. (2017). The relationship between personality type, family support and depression in Indonesian elderly in the home care center of Tresna Werdha Minaula, Kendari, Indonesia. Public Health of Indonesia, 3(2), 61-66. https://doi.org/10.36685/phi.v3i2.123
Ulahannan, A., & Xavier, M. S. (2017). The effect of laughter therapy on depression in elderly residents of selected old age home from Maharashtra. Sinhgad E-journal of Nursing, 7, 1.
Ulahannan, A., & Xaviour, S. (2017). The effect of laughter therapy on depression in elderly residents of selected old age home from Maharashtra.’. Sinhgad E-journal of Nursing, 7, 1.
Utami, A. W., Gusyaliza, R., & Ashal, T. (2018). Hubungan kemungkinan depresi dengan kualitas hidup pada lanjut usia di Kelurahan Surau Gadang Wilayah Kerja Puskesmas Nanggalo Padang [The relationship of the possibility of depression with the quality of life in the elderly in Surau Gadang Village, working area of Community Health Center of Naggalo Padang]. Jurnal Kesehatan Andalas, 7(3), 417-423. https://doi.org/10.25077/jka.v7.i3.p417-423.2018
You, E.-S., & Choi, Y.-H. (2012). The effects of laughter therapy on pain and anxiety among patients with postmastectomy. Journal of East-West Nursing Research, 18(1), 47-52.