Barrett, O. W. (1928). The tropical crops. The Macmillan Company.
Chicago-čujuhus (17. p.)Barrett, Otis Warren. The Tropical Crops. New York: The Macmillan Company, 1928.
MLA-čujuhus (9. p.)Barrett, Otis Warren. The Tropical Crops. The Macmillan Company, 1928.
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