Đọc thêm Râu

Đọc thêm Râu_(người)

Reginald Reynolds: Beards: Their Social Standing, Religious Involvements, Decorative Possibilities, and Value in Offence and Defence Through the Ages (Doubleday, 1949) (ISBN 0-15-610845-3)
Helen Bunkin, Randall Williams: Beards, Beards, Beards (Hunter & Cyr, 2000) (ISBN 1-58838-001-7)
Allan Peterkin: One Thousand Beards. A Cultural History of Facial Hair (Arsenal Pulp Press, 2001) (ISBN 1-55152-107-5)
A Dictionary of Early Christian Beliefs, David W. Bercot, Editor, pg 66–67.
Thomas S. Gowing: The Philosophy of Beards (J. Haddock, 1854); reprinted 2014 by the British Library, ISBN 9780712357661.

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