Hansen, J. C. e., & Cramer, S. H. j. e. (1971). Group guidance and counseling in the schools; selected readings. Appleton-Century-Crofts.
Παραπομπή σε μορφή Chicago (17η εκδ.)Hansen, James C. ed, και Stanley H. joint ed Cramer. Group Guidance and Counseling in the Schools; Selected Readings. New York: Appleton-Century-Crofts, 1971.
Παραπομπή σε μορφή MLA (9th εκδ.)Hansen, James C. ed, και Stanley H. joint ed Cramer. Group Guidance and Counseling in the Schools; Selected Readings. Appleton-Century-Crofts, 1971.
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