Não informado. (1914). Contributions from the Department of Botany. Pennsylvania State College, Department of Botany.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Contributions from the Department of Botany. State College, Pa: Pennsylvania State College, Department of Botany, 1914.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Contributions from the Department of Botany. Pennsylvania State College, Department of Botany, 1914.
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