APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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