APA (7th ed.) Citation

Cooper, M., Freeman, B., Villegas, B., Santos Calderón, J. M., Cadena, C. D., & Calderón, D. (2011). Birds in Colombia (Firts edition.). Villegas Editores.

Chicago Style (17th ed.) Citation

Cooper, Murray, Benjamin Freeman, Benjamín Villegas, Juan Manuel Santos Calderón, Carlos Daniel Cadena, and Diego Calderón. Birds in Colombia. Firts edition. Bogotá: Villegas Editores, 2011.

MLA (9th ed.) Citation

Cooper, Murray, et al. Birds in Colombia. Firts edition. Villegas Editores, 2011.