Leung, K., Chung, P., & Hagger, M. S. (2020). The effects of light volleyball intervention programme in improving selected physical and psychological attributes of older adults in Hong Kong. International journal of sport and exercise psychology, 18(1), S. 1-12. doi:10.1080/1612197X.2018.1462231

Leung, Ka-Man, Pak-Kwong Chung, and Martin S. Hagger. "The Effects of Light Volleyball Intervention Programme in Improving Selected Physical and Psychological Attributes of Older Adults in Hong Kong." International Journal of Sport and Exercise Psychology 18, no. 1 (2020): S. 1-12.

Leung, Ka-Man, Pak-Kwong Chung, and Martin S. Hagger. "The Effects of Light Volleyball Intervention Programme in Improving Selected Physical and Psychological Attributes of Older Adults in Hong Kong." International Journal of Sport and Exercise Psychology 18.1 (2020): S. 1-12.