Cita APA

Hawkins, D. E., & Lindberg, K. (1993). Ecotourism: A guide for planners and managers. Vermont: The Ecotourism Society.

Citación estilo Chicago

Hawkins, Donald E., y Kreg Lindberg. Ecotourism: A Guide for Planners and Managers. Vermont: The Ecotourism Society, 1993.

Cita MLA

Hawkins, Donald E., y Kreg Lindberg. Ecotourism: A Guide for Planners and Managers. Vermont: The Ecotourism Society, 1993.