Kelly, Henry Ansgar, Chaucer and the Cult of Saint Valentine (Brill Academic Publishers, 1997), ISBN 90-04-07849-5. Kelly gives the saint's day of the Genoese Valentine as May 3 and also claims that Richard's engagement was announced on this day.Iol.co.zaDiarkibkan 2009-02-05 di Wayback Machine
Oruch, Jack B., "St. Valentine, Chaucer, and Spring in February", Speculum, 56 (1981): 534–65. Oruch's survey of the literature finds no association between Valentine and romance prior to Chaucer. He concludes that Chaucer is likely to be "the original mythmaker in this instance."Colfa.utsa.edu
Kelly, Henry Ansgar, Chaucer and the Cult of Saint Valentine (Brill Academic Publishers, 1997), ISBN 90-04-07849-5. Kelly gives the saint's day of the Genoese Valentine as May 3 and also claims that Richard's engagement was announced on this day.Iol.co.zaDiarkibkan 2009-02-05 di Wayback Machine