Ullrich de Muynck, R. (1976). Das Assertiveness-Training-Programm ATP. Pfeiffer.
Lua i Stíl Chicago (17ú heag.)Ullrich de Muynck, Rita. Das Assertiveness-Training-Programm ATP. München: Pfeiffer, 1976.
Lua MLA (8ú heag.)Ullrich de Muynck, Rita. Das Assertiveness-Training-Programm ATP. Pfeiffer, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.