Não informado. (1914). Contributions from the Department of Botany. Pennsylvania State College, Department of Botany.
Style de citation Chicago (17e éd.)Não informado. Contributions from the Department of Botany. State College, Pa: Pennsylvania State College, Department of Botany, 1914.
Style de citation MLA (8e éd.)Não informado. Contributions from the Department of Botany. Pennsylvania State College, Department of Botany, 1914.
Attention : ces citations peuvent ne pas être correctes à 100%.