Zhang, Guiqing, Qiujin Zheng, Jingjing Wu, Qiuqin Zheng, et Decong Tang. « A Study on the Correlations among Elder Volunteers’ Participation Motivation, Happiness, and Intention of Continuous Participation ». Revista de Cercetare si Interventie Sociala 68 (mars 10, 2020): 9–21. Consulté le novembre 7, 2026. https://www.rcis.ro/journal/article/view/2665-a-study-on-the-correlations-among-elder-volunteers.