APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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