Nietzel, M. T. (1991). Introduction to clinical psychology (3rd ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Nietzel, Michel T. Introduction to Clinical Psychology. 3rd ed. Englewood, Clifs, N.J: Prentice-Hall, 1991.
Lua MLA (9ú heag.)Nietzel, Michel T. Introduction to Clinical Psychology. 3rd ed. Prentice-Hall, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.