Joseph Sinel, ‘"Step On It" Scale’, 1929, Sotheby's: Important Design

Manufactured by International Ticket Scale Corporation, New York

Dan Klein, All Color Book of Art Deco, London, 1974, p. 32 (for the identical model installed in Radio City Music Hall, New York)
American Union of Decorative Artists and Craftsman, Modern American Design, New York, 1992, p. 85
Wendy Kaplan, ed., Designing Modernity: The Arts of Reform and Persuasion 1885-1945, London, 1995, p. 330
John Stewart Gordon, A Modern World, New Haven, CT, 2011, p. 162 (for the model in the collection of John C. Waddell)

York Theatre, Athol, Massachusetts (Albert J. Smith, architect,1930)