Frost, W. (2011). Zoos and tourism: Conservation, education, entertainment? Channel View Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFrost, Warwick. Zoos and Tourism: Conservation, Education, Entertainment? Bristol, UK: Channel View Publications, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFrost, Warwick. Zoos and Tourism: Conservation, Education, Entertainment? Channel View Publications, 2011.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.