Snelbecker, G. E. (1974). Learning theory, instructional theory, and psychoeducational design. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSnelbecker, Glenn E. Learning Theory, Instructional Theory, and Psychoeducational Design. New York: McGraw-Hill, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSnelbecker, Glenn E. Learning Theory, Instructional Theory, and Psychoeducational Design. McGraw-Hill, 1974.
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