Underhill, Roy. The Woodwright's Shop: a Practical Guide to Traditional Woodcraft, University of North Carolina Press: 1981, ISBN0-8078-4082-3, 202 pages, pp. 39-40 [1]
American Woodworker Dec 1995: No.49, New Track Media, ISSN1074-9152 pp: 43–45.[2]
American Woodworker Dec 1995: No.49, New Track Media, ISSN1074-9152, pp: 43–45.[3]