Barrett, O. W. (1928). The tropical crops. The Macmillan Company.
Chicago Style aipamenaBarrett, Otis Warren. The Tropical Crops. New York: The Macmillan Company, 1928.
MLA aipamenaBarrett, Otis Warren. The Tropical Crops. The Macmillan Company, 1928.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.