Não informado. (1940). Agricultural Science and Genetics Newsletter. U.S. Department of Agriculture.
Chicago Style (17. basım) AtıfNão informado. Agricultural Science and Genetics Newsletter. Cold Spring Harbor, NY: U.S. Department of Agriculture, 1940.
MLA (8th ed.) AtıfNão informado. Agricultural Science and Genetics Newsletter. U.S. Department of Agriculture, 1940.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..