APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

ebrary, Inc, Jennifer Hill, ба Tim Gale. Ecotourism and Environmental Sustainability: Principles and Practice. Farnham, England ; Burlington, VT: Ashgate, 2009.

MLA -ийн эшлэл (9 дэх хэвлэлт)

ebrary, Inc, et al. Ecotourism and Environmental Sustainability: Principles and Practice. Ashgate, 2009.