Humagain, Manoj, Sachita Thapa, Simant Lamichhane, Arjun Hari Rijal, Manisha Neupane, and Prativa Koirala. “Association Between Subjective Happiness and Periodontal Disease in Patients Visiting at a Tertiary Care Centre of Central Nepal”. Journal of Nepalese Society of Periodontology and Oral Implantology 7, no. 1 (December 31, 2023): 3–7. Accessed December 29, 2025. https://www.nepjol.info/index.php/jnspoi/article/view/60881.