Não informado. (1961). Counselor Education and Supervision. American Association for Counseling and Development.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Counselor Education and Supervision. Alexandria, Va: American Association for Counseling and Development, 1961.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Counselor Education and Supervision. American Association for Counseling and Development, 1961.
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