Não informado. (1917). Journal of the Department of Agriculture. University of Puerto Rico.
Chicago-Zitierstil (17. Ausg.)Não informado. Journal of the Department of Agriculture. Rio Piedras, Porto Rico: University of Puerto Rico, 1917.
MLA-Zitierstil (8. Ausg.)Não informado. Journal of the Department of Agriculture. University of Puerto Rico, 1917.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.