Primary Schools Research and Development Group. (1973). Education 3-13: The professional journal for primary education. Longman Group.
Chicago-referens (17:e uppl.)Primary Schools Research and Development Group. Education 3-13: The Professional Journal for Primary Education. Essex, Inglaterra: Longman Group, 1973.
MLA-referens (8:e uppl.)Primary Schools Research and Development Group. Education 3-13: The Professional Journal for Primary Education. Longman Group, 1973.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.