Cita APA (7th ed.)

Barrett, O. W. (1928). The tropical crops. The Macmillan Company.

Cita Chicago (17th ed.)

Barrett, Otis Warren. The Tropical Crops. New York: The Macmillan Company, 1928.

Cita MLA (9th ed.)

Barrett, Otis Warren. The Tropical Crops. The Macmillan Company, 1928.