Tillitt, B., & Bruder, M. N. (1989). Speaking Naturally: Communication Skills in American English. Cambridge: Cambridge University.
Παραπομπή Chicago StyleTillitt, Bruce, και Mary Newton Bruder. Speaking Naturally: Communication Skills in American English. Cambridge: Cambridge University, 1989.
Παραπομπή MLATillitt, Bruce, και Mary Newton Bruder. Speaking Naturally: Communication Skills in American English. Cambridge: Cambridge University, 1989.
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