APA (7th ed.) Citation

Duffy, T. M., & Waller, R. (1985). Designing usable texts. Academic Press, Inc..

Chicago Style (17th ed.) Citation

Duffy, Thomas M., and Robert Waller. Designing Usable Texts. Orlando: Academic Press, Inc., 1985.

MLA (8th ed.) Citation

Duffy, Thomas M., and Robert Waller. Designing Usable Texts. Academic Press, Inc., 1985.

Warning: These citations may not always be 100% accurate.