APA Citation

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

Chicago Style Citation

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

MLA Citation

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

Warning: These citations may not always be 100% accurate.