Arnauld, E.J. (red.) (1940): . Oxford: Blackwell. McKisack, M. (1959): . Oxford: Oxford University Press. ISBN 0-19-821712-9. Fowler, Kenneth Alan (1969): . London. ISBN 0236308122. Prestwich, M.C. (2005): . Oxford: Oxford University Press. ISBN 0-19-822844-9. Ormrod, W. M. (2005): «Henry of Lancaster, first Duke of Lancaster (c.1310–1361)». Oxford Dictionary of National Biography.