Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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