Não informado. (1914). Contributions from the Department of Botany. Pennsylvania State College, Department of Botany.
Chicago-Zitierstil (17. Ausg.)Não informado. Contributions from the Department of Botany. State College, Pa: Pennsylvania State College, Department of Botany, 1914.
MLA-Zitierstil (8. Ausg.)Não informado. Contributions from the Department of Botany. Pennsylvania State College, Department of Botany, 1914.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.