1. White clover and other perennial clovers;Pederson,1995
2. Agricultural Research Service, USDA. Germplasm Resources Information Network [%3ca href=http://www.ars-grin.gov/]. C2015 [Updated 2013 Apr 30; cited 2015 Mar 27]. Available from http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?300625.
3. Handbook of legumes of world economic importance;Duke,1981
4. White clover;Gibson,1985
5. Seed production;Rincker,1985