APA-referens (7:e uppl.)

Heppner, P. P., Wampold, B. E., & Kivlighan, D. M. (1999). Research design in counseling (2nd ed.). Brooks/Cole/Wadsworth.

Chicago-referens (17:e uppl.)

Heppner, P. Paul, Bruce E. Wampold, och Dennis M. Kivlighan. Research Design in Counseling. 2nd ed. Belmont, CA: Brooks/Cole/Wadsworth, 1999.

MLA-referens (9:e uppl.)

Heppner, P. Paul, et al. Research Design in Counseling. 2nd ed. Brooks/Cole/Wadsworth, 1999.