APA aipamena

Hill, J., & Gale, T. (2009). Ecotourism and environmental sustainability: Principles and practice. Ashgate Publishing Limited.

Chicago Style aipamena

Hill, Jennifer, and Tim Gale. Ecotourism and Environmental Sustainability: Principles and Practice. Surrey, England: Ashgate Publishing Limited, 2009.

MLA aipamena

Hill, Jennifer, and Tim Gale. Ecotourism and Environmental Sustainability: Principles and Practice. Ashgate Publishing Limited, 2009.