https://katalog.hfmdd.de/Record/63-9783110234510 Beckmann, Gustav Adolf:
Gualter del Hum - Gaiferos - Waltharius / Gustav Adolf Beckmann. — Berlin : De Gruyter, [2010]. — 1 online resource (207 p.).
ISBN 9783110234510, 9783110637854, 9783110233544, 9783110233605, 9783110301168