APA استشهاد

Ryan, C. (2006). Recreational tourism: Demand and impacts. Viva books.

استشهاد بنمط شيكاغو

Ryan, Chris. Recreational Tourism: Demand and Impacts. New Delhi: Viva books, 2006.

MLA استشهاد

Ryan, Chris. Recreational Tourism: Demand and Impacts. Viva books, 2006.