APA (7th ed.) Citation

McKelvie, O. A. (1920). McKelvie's Megaphone history and law. O.A. McKelvie.

Chicago Style (17th ed.) Citation

McKelvie, Otis Albert. McKelvie's Megaphone History and Law. Lincoln, Neb: O.A. McKelvie, 1920.

MLA (9th ed.) Citation

McKelvie, Otis Albert. McKelvie's Megaphone History and Law. O.A. McKelvie, 1920.