Halls, W. D. (1971). International equivalences in access to higher education: A study of problems with special reference to selected countries. Unesco.
Παραπομπή σε μορφή Chicago (17η εκδ.)Halls, W. D. International Equivalences in Access to Higher Education: A Study of Problems with Special Reference to Selected Countries. Paris: Unesco, 1971.
Παραπομπή σε μορφή MLA (9th εκδ.)Halls, W. D. International Equivalences in Access to Higher Education: A Study of Problems with Special Reference to Selected Countries. Unesco, 1971.
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