Broad Bean and Field Bean - Describes some aspects of botany, and describes pollination requirements in detail. - http://gears.tucson.ars.ag.gov/book/chap4/broad.html
Vicia faba - Notes on botany, cultivation, food value, and commercial production. Purdue University. - http://www.hort.purdue.edu/newcrop/duke_energy/Vicia_faba.html