APA aipamena

Haffer, J. H., & Borrero, J. I. (1965). On birds from northern Colombia.

Chicago Style aipamena

Haffer, Jürgen H., y José I. Borrero. On Birds From Northern Colombia. 1965.

MLA aipamena

Haffer, Jürgen H., y José I. Borrero. On Birds From Northern Colombia. 1965.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.