APA aipamena

Fennel,, D. A. (2003). Ecotourism: An introduction (2.). Routledge.

Chicago Style aipamena

Fennel,, David A. Ecotourism: An Introduction. 2. London: Routledge, 2003.

MLA aipamena

Fennel,, David A. Ecotourism: An Introduction. 2. Routledge, 2003.