Cita APA (7a ed.)
Freytag, G. F., & Debouck, D. G. (2003). Taxonomy, distribution, and ecology of the genus Phaseolus (Leguminosae–Papilionoideae) in North America, México and Central America.
Cita Chicago Style (17a ed.)
Freytag, George F., y Daniel G. Debouck. Taxonomy, Distribution, and Ecology of the Genus Phaseolus (Leguminosae–Papilionoideae) in North America, México and Central America. 2003.
Cita MLA (9a ed.)
Freytag, George F., y Daniel G. Debouck. Taxonomy, Distribution, and Ecology of the Genus Phaseolus (Leguminosae–Papilionoideae) in North America, México and Central America. 2003.
Precaución: Estas citas no son 100% exactas.