Cita APA (7a ed.)

Allen, D. B., & Allen, D. W. (2004). Formula 2+2: The simple solution for successful coaching. Berrett-Koehler Publishers.

Cita Chicago Style (17a ed.)

Allen, Douglas B., y Dwight William Allen. Formula 2+2: The Simple Solution for Successful Coaching. San Francisco: Berrett-Koehler Publishers, 2004.

Cita MLA (9a ed.)

Allen, Douglas B., y Dwight William Allen. Formula 2+2: The Simple Solution for Successful Coaching. Berrett-Koehler Publishers, 2004.