(2007). Organisationsberatung, Supervision, Coaching. Organisationsberatung, Supervision, Coaching.
Citazione stile Chigago Style (17a edizione)"Organisationsberatung, Supervision, Coaching." Organisationsberatung, Supervision, Coaching 2007.
Citatione MLA (8a ed.)"Organisationsberatung, Supervision, Coaching." Organisationsberatung, Supervision, Coaching, 2007.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.