Southworth, Carol M., Pluralism and Stability in the Close: The Canons of Lichfield Cathedral in the Last Quarter of the Fifteenth Century, Thesis, University of Birmingham, January 2012, University of Birmingham Research Archive e-theses repository[1], p.18, footnote 40, quoting: "Le Neve, John, Fasti Ecclesiae Anglicanae 1300-1541 X Coventry and Lichfield Diocese, compiled by B.Jones (London 1964), p.17; Emden, A.B., A Biographical Register of the University of Oxford to 1500, 3 volumes (Oxford 1957-9), p.856"; "Edmund Hals" not listed in the family's pedigree in the Visitations of Devon (Vivian, p.439)
