Teichmann, Frank, The Polarity of Parzifal and Gawain in Wolfram von Eschenbach's Parzifal, in Forward, William, Wolpert, Andrew, The Quest for the Grail, The Golden Blade, 47, Floris Books, Edinburgh, 1994, 22-35

Steiner, Rudolf (Anthroposophie): , 161,26 (25), 162,2-162,3 (25), 222,12-222,14 (26), 223,7 (26), 223,19 (26), 281,16 (24), 301,26-301,27 (28), 326,5-326,8 (28), 402,15 (29), 430,17-430,20 (29), 509,2-509,5 (29-30), 510,20-510,22 (30), 534,24-534,29 (32), 557,6-557,10 (32-33), 557,20-557,22 (30), 558,3-558,7 (30), 689,3-689,5 (31)