Dyfyniad APA

(2002). Ecotourism and certification: Setting standards in practice. Washington: Iskand Press.

Dyfyniad Arddull Chicago

Ecotourism and Certification: Setting Standards in Practice. Washington: Iskand Press, 2002.

Dyfyniad MLA

Ecotourism and Certification: Setting Standards in Practice. Washington: Iskand Press, 2002.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.