Cita APA

Degraaf, R. M., & Witman, G. M. (1979). Trees, shrubs, and vines for attacting birds: A manual for the northeast. Amherst: University of Massachusetts.

Citación estilo Chicago

Degraaf, Richard M., y Gretchin M. Witman. Trees, Shrubs, and Vines for Attacting Birds: A Manual for the Northeast. Amherst: University of Massachusetts, 1979.

Cita MLA

Degraaf, Richard M., y Gretchin M. Witman. Trees, Shrubs, and Vines for Attacting Birds: A Manual for the Northeast. Amherst: University of Massachusetts, 1979.