Cita APA (7th ed.)

Little, E. L. (1979). Forest trees of the United States and Canada: And how to identify them. Dover.

Cita Chicago (17th ed.)

Little, Elbert Luther. Forest Trees of the United States and Canada: And How to Identify Them. Nueva York: Dover, 1979.

Cita MLA (9th ed.)

Little, Elbert Luther. Forest Trees of the United States and Canada: And How to Identify Them. Dover, 1979.