Liber albus II: Fols. 41-63
Calendar of the Manuscripts of the Dean and Chapter of Wells:

…witnessed by John de Clyvedon, John de Erlee, Hugh de Langlond, Ralph de Fisoure, Simon de Roche, John Brette, John de Derburgh, William de Coumbe, and dated Dunsterre, Sunday after St. John ante Portam Latinam 1330.
R.III. f. 43d.

Historical Manuscripts Commission, ‘Liber albus II: Fols. 41-63’, in Calendar of the Manuscripts of the Dean and Chapter of Wells: Volume 1 (London, 1907), pp. 322-336. British History Online http://www.british-history.ac.uk/wells-mss/vol1/pp322-336 [accessed 23 May 2023].