APA (7th ed.) Citation

Unwin, D. (1978). The Encyclopaedia of educational media communications and technology. Macmillan.

Chicago Style (17th ed.) Citation

Unwin, Derick. The Encyclopaedia of Educational Media Communications and Technology. London, England: Macmillan, 1978.

MLA (9th ed.) Citation

Unwin, Derick. The Encyclopaedia of Educational Media Communications and Technology. Macmillan, 1978.