BISHOP, S. (1999). Assertiveness skills training: A sourcebook of activies.-- ed.1. Viva Books Private Limited.
Lua i Stíl Chicago (17ú heag.)BISHOP, Sue. Assertiveness Skills Training: A Sourcebook of Activies.-- Ed.1. New Delhi: Viva Books Private Limited, 1999.
Lua MLA (9ú heag.)BISHOP, Sue. Assertiveness Skills Training: A Sourcebook of Activies.-- Ed.1. Viva Books Private Limited, 1999.
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