Παραπομπή APA

Durham, W. H., & Stronza, A. (2008). Ecotourism and conservation in the Americas. CAB International.

Παραπομπή Chicago Style

Durham, William H., και Amanda Stronza. Ecotourism and Conservation in the Americas. UK: CAB International, 2008.

Παραπομπή MLA

Durham, William H., και Amanda Stronza. Ecotourism and Conservation in the Americas. CAB International, 2008.