APA-viite (7. p.)
Mackenzie, N. (1975). Open learning: Systems and problems in post-secondary education. UNESCO press.
Chicago-viite (17. p.)
Mackenzie, Norman. Open Learning: Systems and Problems in Post-secondary Education. New York: UNESCO press, 1975.
MLA-viite (9. p.)
Mackenzie, Norman. Open Learning: Systems and Problems in Post-secondary Education. UNESCO press, 1975.
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