Frost, W. (2011). Zoos and tourism: Conservation, education, entertainment? Channel View Publications.
Chicago-referens (17:e uppl.)Frost, Warwick. Zoos and Tourism: Conservation, Education, Entertainment? Bristol, UK: Channel View Publications, 2011.
MLA-referens (9:e uppl.)Frost, Warwick. Zoos and Tourism: Conservation, Education, Entertainment? Channel View Publications, 2011.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.