APA

Rosenberg D. K., Wilson M. H. & Cruz F. (1990). The distribution and abundance of the smooth-billed ani Crotophaga ani (L.) in the Galápagos Islands, Ecuador. [S.d.]: [s.d.].

Chicago

Rosenberg D K, Wilson M H and Cruz F. 1990. The distribution and abundance of the smooth-billed ani Crotophaga ani (L.) in the Galápagos Islands, Ecuador. [S.d.]: [s.d.].

Harvard

Rosenberg D. K., Wilson M. H. and Cruz F. (1990). The distribution and abundance of the smooth-billed ani Crotophaga ani (L.) in the Galápagos Islands, Ecuador. [S.d.]: [s.d.].

MLA

Rosenberg D K, Wilson M H and Cruz F. The distribution and abundance of the smooth-billed ani Crotophaga ani (L.) in the Galápagos Islands, Ecuador. [S.d.]: [s.d.]. 1990.