ISBN 0-8156-3160-X* Albert W. Thompson, "The Additions to Chrétien's "Perceval"" in "Arthurian Literature in the Middle Ages", Roger S. Loomis (ed.).
* Albert W. Thompson, "The Additions to Chrétien's "Perceval"" in "Arthurian Literature in the Middle Ages", Roger S. Loomis (ed.).