Tietz, R. (1991). Complete Book of Effective Personal Letters: A Collection of over 400 Model Letters for almost every Form of Personal Correspondence. London: Prentice-Hall.
استشهاد بنمط شيكاغوTietz, Robert. Complete Book of Effective Personal Letters: A Collection of Over 400 Model Letters for Almost Every Form of Personal Correspondence. London: Prentice-Hall, 1991.
MLA استشهادTietz, Robert. Complete Book of Effective Personal Letters: A Collection of Over 400 Model Letters for Almost Every Form of Personal Correspondence. London: Prentice-Hall, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.