Não informado. (1929). Butler University botanical studies. Butler University, Department of Botany.
Style de citation Chicago (17e éd.)Não informado. Butler University Botanical Studies. Indianapolis, Ind: Butler University, Department of Botany, 1929.
Style de citation MLA (8e éd.)Não informado. Butler University Botanical Studies. Butler University, Department of Botany, 1929.
Attention : ces citations peuvent ne pas être correctes à 100%.