Cita APA (7th ed.)

Harlow, W. M. (1957). Trees of the eastern and central United States and Canada. Dover.

Cita Chicago (17th ed.)

Harlow, William M. Trees of the Eastern and Central United States and Canada. Nueva York: Dover, 1957.

Cita MLA (9th ed.)

Harlow, William M. Trees of the Eastern and Central United States and Canada. Dover, 1957.