Παραπομπή APA

Hopson, B., & Scally, M. (1994). Twelve steps to success through service. Excel.

Παραπομπή Chicago Style

Hopson, Barrie, και Mike Scally. Twelve Steps to Success Through Service. New Delhi: Excel, 1994.

Παραπομπή MLA

Hopson, Barrie, και Mike Scally. Twelve Steps to Success Through Service. Excel, 1994.