Dyfyniad APA
Heppner, P. P., Wampold, B. E., Owen, J., Wang, K. T., & Thompson, M. N. (2015). Research design in counseling. (Fourth Edition.). Cengage Learning.
Dyfyniad Arddull Chicago
Heppner, P. Paul, Bruce E. Wampold, Jesse Owen, Kenneth T. Wang, and Mindi N. Thompson. Research Design in Counseling. Fourth Edition. Boston, MA: Cengage Learning, 2015.
Dyfyniad MLA
Heppner, P. Paul, et al. Research Design in Counseling. Fourth Edition. Cengage Learning, 2015.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.