Dyfyniad APA

Heppner, P. P. (2008). Research design in counseling. Belmont, CA: Thomson Brooks/Cole.

Dyfyniad Arddull Chicago

Heppner, P. Paul. Research Design in Counseling. Belmont, CA: Thomson Brooks/Cole, 2008.

Dyfyniad MLA

Heppner, P. Paul. Research Design in Counseling. Belmont, CA: Thomson Brooks/Cole, 2008.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.