Volunteer Service and Well-Being of Older People in China oleh Hua-lei Yang, Shuo Zhang, Wen-chao Zhang, Zheng Shen, Jia-hao Wang, Si-meng Cheng, Yi-wen Tao, Si-qing Zhang, Li-xingzi Yang, Yi-dan Yao, Lin Xie, Li-li Tang, Yuan-yang Wu, Zhi-yun Li