Cita APA (7a ed.)

Able, K. P., & Lippincott, C. (1999). Gatherings of angels: Migrating birds and their ecology. Comstock Books.

Cita Chicago Style (17a ed.)

Able, Kenneth P., y Cindy Lippincott. Gatherings of Angels: Migrating Birds and Their Ecology. Ithaca, NY: Comstock Books, 1999.

Cita MLA (9a ed.)

Able, Kenneth P., y Cindy Lippincott. Gatherings of Angels: Migrating Birds and Their Ecology. Comstock Books, 1999.