Cita APA (7th ed.)

Howells, W. W. (1963). Back of history: The story of our own origins (Rev. ed.). Doubleday.

Cita Chicago (17th ed.)

Howells, William White. Back of History: The Story of Our Own Origins. Rev. ed. Garden City, N.Y: Doubleday, 1963.

Cita MLA (9th ed.)

Howells, William White. Back of History: The Story of Our Own Origins. Rev. ed. Doubleday, 1963.