Newby, H. A., & Popelka, G. R. (1992). Audiology (6th ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Newby, Hayes A., agus Gerald R. Popelka. Audiology. 6th ed. Englewood Cliffs, NJ: Prentice Hall, 1992.
Lua MLA (9ú heag.)Newby, Hayes A., agus Gerald R. Popelka. Audiology. 6th ed. Prentice Hall, 1992.
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