Alessandra, A. J. (2006). Assertiveness skills (2nd ed.). Team Publications & Worldwide Center for Organizational Development.
Chicago-Zitierstil (17. Ausg.)Alessandra, Anthony J. Assertiveness Skills. 2nd ed. [S.l.]: Team Publications & Worldwide Center for Organizational Development, 2006.
MLA-Zitierstil (9. Ausg.)Alessandra, Anthony J. Assertiveness Skills. 2nd ed. Team Publications & Worldwide Center for Organizational Development, 2006.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.