APA (7th ed.) Citation

Fennell, D. A. (1999). Ecotourism: An introduction. Routledge.

Chicago Style (17th ed.) Citation

Fennell, David A. Ecotourism: An Introduction. London: Routledge, 1999.

MLA (9th ed.) Citation

Fennell, David A. Ecotourism: An Introduction. Routledge, 1999.