Kuswoyo, Fatwa Tentama, and Pipih Muhopilah. “Altruism Scale: A Psychometric Study for Junior High School Student”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 51, no. 2 (May 13, 2020): 208–219. Accessed April 30, 2024. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/10818.