Black, J. W., & Irwin, R. (1969). Voice and diction: Phonation and phonology. C.E. Merrill.
Lua i Stíl Chicago (17ú heag.)Black, John Wilson, agus Ruth Irwin. Voice and Diction: Phonation and Phonology. Columbus, Ohio: C.E. Merrill, 1969.
Lua MLA (9ú heag.)Black, John Wilson, agus Ruth Irwin. Voice and Diction: Phonation and Phonology. C.E. Merrill, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.