Παραπομπή APA

Martens, R. (2012). Successful coaching (4.). Human Kinetics.

Παραπομπή Chicago Style

Martens, Rainer. Successful Coaching. 4. Usa: Human Kinetics, 2012.

Παραπομπή MLA

Martens, Rainer. Successful Coaching. 4. Human Kinetics, 2012.