Cita APA

Ashton, P. M. S., & Ashton, P. M. S. (1985). A field guide to the common trees and large shrubs of Puerto Rico (2. edition.). [Lugar de publicación no identificado]: Tropical Resources Institute.

Citación estilo Chicago

Ashton, P. Mark S., y P. Mark S. Ashton. A Field Guide to the Common Trees and Large Shrubs of Puerto Rico. 2. edition. [Lugar de publicación no identificado]: Tropical Resources Institute, 1985.

Cita MLA

Ashton, P. Mark S., y P. Mark S. Ashton. A Field Guide to the Common Trees and Large Shrubs of Puerto Rico. 2. edition. [Lugar de publicación no identificado]: Tropical Resources Institute, 1985.