Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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