Book
Freytag, George F.
Freytag, George F.; Debouck, Daniel G. 2002. Taxonomy, distribution, and ecology of the genus phaseolus (Leguminosae-papilionoideae) in North America, Mexico and Central America. Botanical Research Institute of Texas (BRIT), Forth Worth, TX, USA. 298 p. (Sida, botanical miscellany no. 23)