एपीए उद्धरण

Bien, A. (1999). Errors and principles of action of ecotourism projects.

शिकागो स्टाइल उद्धरण

Bien, Amos. Errors and Principles of Action of Ecotourism Projects. 1999.

एमएलए उद्धरण

Bien, Amos. Errors and Principles of Action of Ecotourism Projects. 1999.