Deng, Fei-Hu, Yuan-Heng Gao, and Qiao-Li Tian. 2020. “Effects of Ecotourism Travel Motivation and Social Relations on Mental State of the Middle-Aged and Elderly Group”. Revista de Cercetare Si Interventie Sociala 70 (September): 20-30. https://doi.org/10.33788/rcis.70.2.