APA (7th ed.) Citation

Merrill, M. D., & Twitchell, D. (1994). Instructional design theory. Educational Technology Publications.

Chicago Style (17th ed.) Citation

Merrill, M. David, and David Twitchell. Instructional Design Theory. Englewood Cliffs, N.J.: Educational Technology Publications, 1994.

MLA (9th ed.) Citation

Merrill, M. David, and David Twitchell. Instructional Design Theory. Educational Technology Publications, 1994.