The Chaucer Review: An Indexed Bibliography (Vols. 1-30)

Urban, William. "When Was Chaucer's Knight in 'Ruce'?" 18 (1984): 347-53.
The mention of "Ruce" in the Knight's portrait in the General Prologue refers to a small part of Samogithia, possibly making the Knight a complimentary reference to Henry of Derby.