Cita APA (7a ed.)

Campbell, J. A. (1988). The distribucion, variation, natural history, and relationships of Porthidium barbouri (Viperidae). Instituto de Ecología, A.C.

Cita Chicago Style (17a ed.)

Campbell, Jonathan A. The Distribucion, Variation, Natural History, and Relationships of Porthidium Barbouri (Viperidae). Instituto de Ecología, A.C, 1988.

Cita MLA (9a ed.)

Campbell, Jonathan A. The Distribucion, Variation, Natural History, and Relationships of Porthidium Barbouri (Viperidae). Instituto de Ecología, A.C, 1988.