London: Sheed and Ward, 1975. 8vo.,pp. xiii,264, hardcover, gilt; ownership bookplate to front paste down endpaper, light toning and some pencilling to text, otherwise very good, in a very good unclipped dust-jacket, which is rubbed to extremities and lightly sunned to spine.

London: Longmans, Green & Co. First edition, 12mo., pp.34,(2)adverts, green cloth; small area of residue from stickers to front board, light soiling, a very good copy.

8vo., pp.xxiv,603, paperback; crease to lower corner of rear wrapper, light curling to wrappers, a very good, fresh copy.

West Lafayette, Indiana: Purdue University Press, 1997. 8vo., pp.xvi,296, black cloth lettered in white; from the library of D.E. Luscombe, with ownership autograph to front free endpaper, foxing to top edges - and, lightly, to endpapers and fore-edges, otherwise fresh, a very good copy, in very good unclipped dust-jacket.

Phaladelphia: University of Philadelphia Press, 1989. 8vo.,pp. xii,211, brown cloth, gilt; ownership bookplate to front paste down endpaper, a near-fine copy, in a near-fine unclipped dust-jacket.

Toronto: The Pontifical Institute of Medieval Studies, 1971. 8vo.,pp. 261, paperback; presentation copy from the author with inscription to half title page, light toning to margins, sunning to spine and extremities, light creasing to spine and light rubbing to extremities, otherwise very good.

Oxford: Clarendon Press, 1991. 8vo., pp.(v),269, brown printed hardcover; a fine copy. No dust-jacket.

Oxford: Oxford University Press, 1992. 8vo.,pp. 293, hardcover, gilt; ownership inscription to front paste down endpaper, a very good copy, in a very good unclipped dust-jacket.

Oxford: Oxford University Press, 2003. Reprint, 8vo.,pp. 269, printed hardcover, white lettering; ownership inscription to front paste down endpaper, lightly sunned to spine, a very good copy. No dust-jacket as issued.

Oxford: Clarendon Press, 1996. 8vo.,pp. 312, hardcover, gilt lettering; ownership inscription to front paste down endpaper, a very good copy, in a very good unclipped dust-jacket.

Oxford University Press, 2001. First edition, 8vo., pp.viii,380, paperback; from the library of Gordon Leff, with ownership inscription to front wrapper verso, else a fresh and near-fine copy.

Lanham, Maryland: Lexington Books, 2010. 8vo., pp.xvii,113, glazed hardcover, frontispiece portrait; a fine copy. No dust-jacket, as issued.

Oxford: Oxford University Press, 2001. 8vo., pp.cxxi,246, hardcover, gilt; a near-fine copy, in a very good unclipped dust-jacket, which is lightly sunned to spine.

Oxford University Press, 2001. 8vo., pp.cxxi,246, navy hardcover, gilt; from the library of D.E. Luscombe, with editor’s presentation inscription to front free endpaper, a near-fine copy, in unclipped dust-jacket, which is lightly sunned to spine, with small closed tear to front upper margin, else very good.

Gainsville: University Press of Florida, 1993. 8vo., pp.xv,288, red hardcover, gilt, 4 b/w plates; very slight soiling to edges, very slight rubbing to extremities, head and tail of spine very lightly creased, a very good copy indeed.

Oxford: Oxford University Press, 2004. 8vo.,pp. xvi,272, paperback; ownership inscription to front wrapper verso, a very good copy.

Toronto: Centre for Medieval Studies by the Pontifical Institute of Mediaeval Studies, 1974. 8vo., pp.(v),107, paperback; from the library of D.E. Luscombe, with small inscriptions to prelims, light pencil scoring to margins, light sunning to spine, with light rubbing to extremities, internally fresh and otherwise very good.

Tubingen, J.C.B. Mohr (Paul Siebeck). 8vo.,pp. xii,384, blue cloth, gilt; light toning to margins with slight tobacco odour, a very good copy, in a very good unclipped dust-jacket, which is sunned to spine, with light sunning and soiling to extremities, creasing and a small chip to head of spine.

Oxford: Princeton University Press, 2012. 8vo., pp.xxi,280, pictorial hardcover; very slight shelf-wear to boards, a near fine copy. No dust-jacket as issued.

Belgium: Brepols Publishers, 2020. 8vo., pp.,202, pictorial hardcover, b/w illustrations; a very good copy. No dust-jacket.