Cita APA

Ralph, C. J., & Scott, J. M. (1981). Estimating numbers of terrestrial birds. Nuevo Mexico: Cooper Ornithological Society.

Citación estilo Chicago

Ralph, C. J., y J. M. Scott. Estimating Numbers of Terrestrial Birds. Nuevo Mexico: Cooper Ornithological Society, 1981.

Cita MLA

Ralph, C. J., y J. M. Scott. Estimating Numbers of Terrestrial Birds. Nuevo Mexico: Cooper Ornithological Society, 1981.