Rollins, R. C. 1., & Foster, R. C. 1. (1970). Contributions from the Gray Herbarium of Harvard University. Cambridge, Mass., U.S.A.: The Gray Herbarium of Harvard University.
Citación estilo ChicagoRollins, Reed Clark 1911-1998, y Robert Crichton 1904-1986 Foster. Contributions From the Gray Herbarium of Harvard University. Cambridge, Mass., U.S.A.: The Gray Herbarium of Harvard University, 1970.
Cita MLARollins, Reed Clark 1911-1998, y Robert Crichton 1904-1986 Foster. Contributions From the Gray Herbarium of Harvard University. Cambridge, Mass., U.S.A.: The Gray Herbarium of Harvard University, 1970.
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