Cita APA (7a ed.)

Marden, O. S. (1898). The secret of achievement. Marden, Orison Swett.

Cita Chicago Style (17a ed.)

Marden, Orison Swett. The Secret of Achievement. New York: Marden, Orison Swett, 1898.

Cita MLA (8a ed.)

Marden, Orison Swett. The Secret of Achievement. Marden, Orison Swett, 1898.