APA (7th ed.) Zitazioa

Duellman, W. E. A Review of the Middle American Tree Frogs of the Genus Ptychohyla.

Chicago Style (17th ed.) Zitazioa

Duellman, William Edward. A Review of the Middle American Tree Frogs of the Genus Ptychohyla.

MLA (9th ed.) Zitazioa

Duellman, William Edward. A Review of the Middle American Tree Frogs of the Genus Ptychohyla.