Primary Schools Research and Development Group. (1973). Education 3-13: The professional journal for primary education. Longman Group.
Παραπομπή σε μορφή Chicago (17η εκδ.)Primary Schools Research and Development Group. Education 3-13: The Professional Journal for Primary Education. Essex, Inglaterra: Longman Group, 1973.
Παραπομπή σε μορφή MLA (8th εκδ.)Primary Schools Research and Development Group. Education 3-13: The Professional Journal for Primary Education. Longman Group, 1973.
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