Dan R Minnick. (1989). A guide to creating self-learning materials. Manila: IRRI.
Trích dẫn kiểu ChicagoDan R Minnick. A Guide to Creating Self-learning Materials. Manila: IRRI, 1989.
Deismireacht MLADan R Minnick. A Guide to Creating Self-learning Materials. Manila: IRRI, 1989.
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