APA (7th ed.) Zitazioa
Heppner, P. P., Wampold, B. E., Owen, J., Wang, K. T., & Thompson, M. N. (2015). Research design in counseling. (Fourth Edition.). Cengage Learning.
Chicago Style (17th ed.) Zitazioa
Heppner, P. Paul, Bruce E. Wampold, Jesse Owen, Kenneth T. Wang, eta Mindi N. Thompson. Research Design in Counseling. Fourth Edition. Boston, MA: Cengage Learning, 2015.
MLA (9th ed.) Zitazioa
Heppner, P. Paul, et al. Research Design in Counseling. Fourth Edition. Cengage Learning, 2015.
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