oring onions". Iowa State University Extension. සම්ප්‍රවේශය 2013-03-28.↑ Brewster, James L. (1994). Onions and other vegetable Alliums (1st ed.). Wallingford, UK: CAB International. p. 5. ISBN 0-85198-753-2.↑ "I'Itoi Onion". Ark of Taste. Slow Food USA. 2010. සම්ප්‍රවේශය 2013-03-25.↑ Germplasm Resources Information Network - (GRIN). "Allium x proliferum information from NPGS/GRIN". USDA, ARS, National Genetic Resources Program. සම්ප්‍රවේශය 21 February 2011.↑ 61.0 61.1 Fritsch, R.M. (2002). "Chapter 1: Evolution, Domestication, and Taxonomy". In H.D. Rabinowitch and L. Currah (ed.). Allium Crop Science: Recent Advances. Wallingford, UK: CABI Publishing. p. 19. ISBN 0-85199-510-1. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)↑ Brewster, James L. (1994). Onions and other vegetable Alliums (1st ed.). Wallingford, UK: CAB International. p. 15. ISBN 0-85198-753-2.↑ Friesen, N. & M. Klaas (1998). "Origin of some vegetatively propagated Allium cro