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.
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