Tillitt, B., & Bruder, M. N. (1989). Speaking Naturally: Communication Skills in American English. Cambridge: Cambridge University.
استشهاد بنمط شيكاغوTillitt, Bruce, و Mary Newton Bruder. Speaking Naturally: Communication Skills in American English. Cambridge: Cambridge University, 1989.
MLA استشهادTillitt, Bruce, و Mary Newton Bruder. Speaking Naturally: Communication Skills in American English. Cambridge: Cambridge University, 1989.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.