APA

Gonzaga L. P., Collar N. J., Krabbe N., Madroño Nieto A., Naranjo L. G., Parker T. A., Wege D. C. & International Council for Bird Preservation. (1992). Threatened birds of the Americas. Washington, DC: Smithsonian Institution Press.

Chicago

Gonzaga L P, Collar N J, Krabbe N, Madroño Nieto A, Naranjo L G, Parker T A, Wege D C and International Council for Bird Preservation. 1992. Threatened birds of the Americas. Washington, DC: Smithsonian Institution Press.

Harvard

Gonzaga L. P., Collar N. J., Krabbe N., Madroño Nieto A., Naranjo L. G., Parker T. A., Wege D. C. and International Council for Bird Preservation. (1992). Threatened birds of the Americas. Washington, DC: Smithsonian Institution Press.

MLA

Gonzaga L P, Collar N J, Krabbe N, Madroño Nieto A, Naranjo L G, Parker T A, Wege D C and International Council for Bird Preservation. Threatened birds of the Americas. Washington, DC: Smithsonian Institution Press. 1992.