Ryan, C. (1991). Recreational tourism: A social science perspective. Routledge.
芝加哥风格引文Ryan, Chris. Recreational Tourism: A Social Science Perspective. London: Routledge, 1991.
MLA引文Ryan, Chris. Recreational Tourism: A Social Science Perspective. Routledge, 1991.
警告：这些引文格式不一定是100％准确.