Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.