Cita APA (7a ed.)

Servín, J. (2000). Duration and frecuency of chorus howling of the mexican wolf (Canis lupus baileyi). Instituto de Ecología, A.C.

Cita Chicago Style (17a ed.)

Servín, Jorge. Duration and Frecuency of Chorus Howling of the Mexican Wolf (Canis Lupus Baileyi). Instituto de Ecología, A.C, 2000.

Cita MLA (9a ed.)

Servín, Jorge. Duration and Frecuency of Chorus Howling of the Mexican Wolf (Canis Lupus Baileyi). Instituto de Ecología, A.C, 2000.