APA (7th ed.) Citation

Graham, S. (1947). There was once a slave: The heroic story of Frederick Douglass. Messner.

Chicago Style (17th ed.) Citation

Graham, Shirley. There Was Once a Slave: The Heroic Story of Frederick Douglass. New York: Messner, 1947.

MLA (9th ed.) Citation

Graham, Shirley. There Was Once a Slave: The Heroic Story of Frederick Douglass. Messner, 1947.