Cita APA (7a ed.)

Pinchot, G., & Pinchot, E. (1993). Unleashing intelligence. [s.n.].

Cita Chicago Style (17a ed.)

Pinchot, Gifford, y Elizabeth Pinchot. Unleashing Intelligence. [S.l.]: [s.n.], 1993.

Cita MLA (9a ed.)

Pinchot, Gifford, y Elizabeth Pinchot. Unleashing Intelligence. [s.n.], 1993.