APA (7th ed.) Citation

Hughes, T. P. (1971). Elmer Sperry: Inventor and engineer. Hopkins.

Chicago Style (17th ed.) Citation

Hughes, Thomas P. Elmer Sperry: Inventor and Engineer. Baltimore [u.a.]: Hopkins, 1971.

MLA (8th ed.) Citation

Hughes, Thomas P. Elmer Sperry: Inventor and Engineer. Hopkins, 1971.