APA (7th ed.) Citation

De Los Santos, F. D., & Guanco, A. Status of ecotourism in the world.

Chicago Style (17th ed.) Citation

De Los Santos, Frederick D.C, and Arnold Guanco. Status of Ecotourism in the World. 1992.

MLA (9th ed.) Citation

De Los Santos, Frederick D.C, and Arnold Guanco. Status of Ecotourism in the World.