Travis, L. E. (1971). Handbook of speech pathology and audiology. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Travis, Lee Edward. Handbook of Speech Pathology and Audiology. Englewood Cliffs, N. J: Prentice-Hall, 1971.
Lua MLA (9ú heag.)Travis, Lee Edward. Handbook of Speech Pathology and Audiology. Prentice-Hall, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.