Simpson, D. R., & Janos, D. (1972). A punch card key to the families of dicotyledons of the western hemisphere south of the United States. Chicago, Illinois: Field Museum of Natural History.
Citación estilo ChicagoSimpson, Donald R., y David Janos. A Punch Card Key to the Families of Dicotyledons of the Western Hemisphere South of the United States. Chicago, Illinois: Field Museum of Natural History, 1972.
Cita MLASimpson, Donald R., y David Janos. A Punch Card Key to the Families of Dicotyledons of the Western Hemisphere South of the United States. Chicago, Illinois: Field Museum of Natural History, 1972.
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