ISBN 0-9658533-0-6*John Sloan, "The stirrup controversy"*Medieval Technology Pages:Paul J. Gans, The great stirrup controversy"*Gies, Frances and Joseph.
ISBN 0-9658533-0-6*John Sloan, "The stirrup controversy"*Medieval Technology Pages:Paul J. Gans, The great stirrup controversy"*Gies, Frances and Joseph.