APA-referens (7:e uppl.)
Mackenzie, N. (1975). Open learning: Systems and problems in post-secondary education. UNESCO press.
Chicago-referens (17:e uppl.)
Mackenzie, Norman. Open Learning: Systems and Problems in Post-secondary Education. New York: UNESCO press, 1975.
MLA-referens (9:e uppl.)
Mackenzie, Norman. Open Learning: Systems and Problems in Post-secondary Education. UNESCO press, 1975.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.