1. On Levi Gunn's tenure as president: Kellogg, Lucy Cutler. History of Greenfield, 1900-1929. Greenfield, Mass. : Town of Greenfield, 1931. p. 1601-1602.
2. On the date of the Langdon acquisition: "The Millers Falls Co." Hardware Dealers Magazine, v. 43, no. 253, January 1915, p. 111.