Parsons, John Carmi (2008): «Margaret (1279?–1318)» i: Oxford Dictionary of National Biography, utgave online. Oxford, UK: Oxford University Press. doi:10.1093/ref:odnb/18046. Betalingsmur
edwardthesecond.blogspot.no
Warner, Kathryn (10. mai 2008): «Eleanor of Castile», Edwardthesecond. Sitat: «Eleanor bore at least fourteen, and perhaps sixteen, children. Historians and genealogists have made a right mess of them, adding children who never existed…»
