JSTOR Ref
J.H. Mozley Apologia de Barbis, by Burchardus de Bellevaux ; a Twelfth Century Treatise on Beards and their Moral and Mystical Significance, now for the first time edited from the only known manuscript (British Museum MS. add. 41997), by E. Ph. Goldschmidt 5.3 (1936), 219-222 DOI:10.2307/43626008
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