Williams, Watkin Genetical principles and breeding Oxford, Blackwell Scientific Pub. [c1964] 504 p. ilus., diagra., tablas. 23 cm (Botanical monographs, v. 5) "Bibliography": p. [458]-487 <a id= "rdfa" about="http://bnjm.sld.cu/cgi-bin/item.py?idficha=bcuhcgrlyfof01100424" property = "oa:link" href="http://www.worldcat.org/oclc/ 504511027 ">WorldCat</a>