Não informado. (1942). Plant science literature. U.S. Department of Agriculture, Bureau of Plant Industry.
Chicago-Zitierstil (17. Ausg.)Não informado. Plant Science Literature. Washington: U.S. Department of Agriculture, Bureau of Plant Industry, 1942.
MLA-Zitierstil (8. Ausg.)Não informado. Plant Science Literature. U.S. Department of Agriculture, Bureau of Plant Industry, 1942.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.