https://onlinebooks.library.upenn.edu/webbin/book/lookupid?key=olbp70294

References source: http://www.celtic-twilight.com/camelot/bruce_dictionary/index.htm which can be found on the Internet Archive (original site is dead) at.

https://web.archive.org/web/20170522152947/http://www.celtic-twilight.com/camelot/bruce_dictionary/index.htm

Armstrong, Dorsey. King Arthur: History and Legend (Course Guidebook). Great Courses 2376. Chantilly, VA: The Teaching Company, 2015.

King Arthur: History and Legend. Streaming Video. Vol. 2376. The Great Courses: Literature and Language. Chantilly, VA: The Teaching Company, 2015. https://www.wondrium.com/king-arthur-history-and-legend.