Cita APA (7a ed.)

Selk, J. (2012). Executive toughness: The mental-training program to increase your leadership performance. McGraw-Hill.

Cita Chicago Style (17a ed.)

Selk, Jason. Executive Toughness: The Mental-training Program to Increase Your Leadership Performance. New York: McGraw-Hill, 2012.

Cita MLA (8a ed.)

Selk, Jason. Executive Toughness: The Mental-training Program to Increase Your Leadership Performance. McGraw-Hill, 2012.