Não informado. (1891). Contributions from the Gray Herbarium of Harvard University. Harvard University.
Style de citation Chicago (17e éd.)Não informado. Contributions from the Gray Herbarium of Harvard University. Cambridge, Mass: Harvard University, 1891.
Style de citation MLA (8e éd.)Não informado. Contributions from the Gray Herbarium of Harvard University. Harvard University, 1891.
Attention : ces citations peuvent ne pas être correctes à 100%.