A critical edition of Gorboduc - Walsh, Maureen; Norton, Thomas 1532-1584; Dorset, Thomas Sackville of 1536-1608 (Univ.Microfilms, 1964)
Saint Louis, Mo., Univ., diss. - EST: Ferrex and Porrex. - Darin: Norton, Thomas: +The tragedie of Gorboduc. Sackville, Thomas: +The tragedie of Gorboduc