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Kubler, George Adolf (1927). A Short History of Stereotyping. New York: Printed by Brooklyn Eagle Commercial Printing Dept. for the Certified Dry Mat Corporation. hdl:2027/mdp.39015035113607. Archived from the original on 2020-08-31. Retrieved 2020-08-12 – via The Hathi Trust (access may be limited outside the United States).
Imperial Type Metal Company (1927). Type Metal Alloys. New York: Imperial Type Metal Co. p. 33. Archived from the original on 2020-08-31. Retrieved 2020-08-31.
Imperial Type Metal Company (1927). Type Metal Alloys. New York: Imperial Type Metal Co. p. 33. Archived from the original on 2020-08-31. Retrieved 2020-08-31.