Não informado. (1940). Agricultural Science and Genetics Newsletter. U.S. Department of Agriculture.
Chicago-Zitierstil (17. Ausg.)Não informado. Agricultural Science and Genetics Newsletter. Cold Spring Harbor, NY: U.S. Department of Agriculture, 1940.
MLA-Zitierstil (8. Ausg.)Não informado. Agricultural Science and Genetics Newsletter. U.S. Department of Agriculture, 1940.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.