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Sampath, K., Panneerselvam, A., & Santhanam, S. (1990). Introduction to educational technology (3rd rev ed.). New Delhi: Sterling Publishers Private Limited.

Sampath, K., A. Panneerselvam, and S. Santhanam. Introduction to Educational Technology. 3rd rev ed. New Delhi: Sterling Publishers Private Limited, 1990.

Sampath, K., A. Panneerselvam, and S. Santhanam. Introduction to Educational Technology. 3rd rev ed. New Delhi: Sterling Publishers Private Limited, 1990.