Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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