O'Neill, J. J. (1981). Visual communication for the hard of hearing: History, research, methods (2nd ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)O'Neill, John Joseph. Visual Communication for the Hard of Hearing: History, Research, Methods. 2nd ed. Englewood Cliffs, N. J: Prentice-Hall, 1981.
Lua MLA (9ú heag.)O'Neill, John Joseph. Visual Communication for the Hard of Hearing: History, Research, Methods. 2nd ed. Prentice-Hall, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.