Gillen, T. (1995). Assertiveness. Universities Press.
Lua i Stíl Chicago (17ú heag.)Gillen, Terry. Assertiveness. Hyderabad: Universities Press, 1995.
Lua MLA (9ú heag.)Gillen, Terry. Assertiveness. Universities Press, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.