Heppner, P. P., & P. Paul Heppner; Bruce E. Wampold; Dennis M. Kivlighan; Jr. (2008). Research design in counseling. Belmont, CA: Thomson Brooks/Cole.
Čikaški stil citiranjaHeppner, P. Paul, i P. Paul Heppner; Bruce E. Wampold; Dennis M. Kivlighan; Jr. Research Design in Counseling. Belmont, CA: Thomson Brooks/Cole, 2008.
MLA način citiranjaHeppner, P. Paul, i P. Paul Heppner; Bruce E. Wampold; Dennis M. Kivlighan; Jr. Research Design in Counseling. Belmont, CA: Thomson Brooks/Cole, 2008.
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