APA (7th ed.) Citation

Willis, B. (1993). Distance education: A practical guide. Educational Technology Publications.

Chicago Style (17th ed.) Citation

Willis, Barry. Distance Education: A Practical Guide. Englewood Cliffs, N.J.: Educational Technology Publications, 1993.

MLA (9th ed.) Citation

Willis, Barry. Distance Education: A Practical Guide. Educational Technology Publications, 1993.