APA (7th ed.) Citation

Selk, J., & Haag, J. (2011). Executive toughness: The mental-training program to increase your leadership performance ([First edition].). McGraw Hill-Ascent Audio.

Chicago Style (17th ed.) Citation

Selk, Jason, and John Haag. Executive Toughness: The Mental-training Program to Increase Your Leadership Performance. [First edition]. [Place of publication not identified]: McGraw Hill-Ascent Audio, 2011.

MLA (8th ed.) Citation

Selk, Jason, and John Haag. Executive Toughness: The Mental-training Program to Increase Your Leadership Performance. [First edition]. McGraw Hill-Ascent Audio, 2011.