Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Selk, Jason, y 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.

Cita MLA (8a ed.)

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