Não informado. (1913). Journal of agricultural research. U.S. Department of Agriculture.
Chicago-Zitierstil (17. Ausg.)Não informado. Journal of Agricultural Research. Washington: U.S. Department of Agriculture, 1913.
MLA-Zitierstil (8. Ausg.)Não informado. Journal of Agricultural Research. U.S. Department of Agriculture, 1913.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.