Cita APA (7a ed.)

Boo, E. (1990). Ecotourism: The potentials and pitfalls. World Wildlife Fund.

Cita Chicago Style (17a ed.)

Boo, Elizabeth. Ecotourism: The Potentials and Pitfalls. Washington, D.C.: World Wildlife Fund, 1990.

Cita MLA (9a ed.)

Boo, Elizabeth. Ecotourism: The Potentials and Pitfalls. World Wildlife Fund, 1990.