Não informado. (1939). Contributions from the University of Michigan Herbarium. University of Michigan Herbarium.
Čikaški stil citiranja (17. izdanje)Não informado. Contributions from the University of Michigan Herbarium. Ann Arbor, Mich: University of Michigan Herbarium, 1939.
MLA način citiranja (8. izdanje)Não informado. Contributions from the University of Michigan Herbarium. University of Michigan Herbarium, 1939.
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