Tillitt, B., & Bruder, M. N. (1985). Speaking naturally: Communication skills in American English. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Tillitt, Bruce, agus Mary Newton Bruder. Speaking Naturally: Communication Skills in American English. Cambridge [Cambridgeshire] ; New York: Cambridge University Press, 1985.
Lua MLA (8ú heag.)Tillitt, Bruce, agus Mary Newton Bruder. Speaking Naturally: Communication Skills in American English. Cambridge University Press, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.