Secord, W., Shames, G. H., & Wiig, E. H. (1994). Human communication disorders: An introduction (4th ed.). Merrill.
Lua i Stíl Chicago (17ú heag.)Secord, Wayne, George H. Shames, agus Elisabeth H. Wiig. Human Communication Disorders: An Introduction. 4th ed. New York: Merrill, 1994.
Lua MLA (9ú heag.)Secord, Wayne, et al. Human Communication Disorders: An Introduction. 4th ed. Merrill, 1994.
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