University of Pennsylvania. Botanical Laboratory. (1892). Contributions from the Botanical Laboratory. University of Pennsylvania Press.
Citace podle Chicago (17th ed.)University of Pennsylvania. Botanical Laboratory. Contributions from the Botanical Laboratory. Philadelphia: University of Pennsylvania Press, 1892.
Citace podle MLA (8th ed.)University of Pennsylvania. Botanical Laboratory. Contributions from the Botanical Laboratory. University of Pennsylvania Press, 1892.
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