APA aipamena

Lamar, W. W., & Sasa, M. (2003). A new species of hognose pitviper, genus Porthidium, from the southwestern Pacific of Costa Rica (Serpentes: Viperidae).

Chicago Style aipamena

Lamar, William W., y Mahmood Sasa. A New Species of Hognose Pitviper, Genus Porthidium, From the Southwestern Pacific of Costa Rica (Serpentes: Viperidae). 2003.

MLA aipamena

Lamar, William W., y Mahmood Sasa. A New Species of Hognose Pitviper, Genus Porthidium, From the Southwestern Pacific of Costa Rica (Serpentes: Viperidae). 2003.