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.
Παραπομπή Chicago StyleTietz, 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.
Παραπομπή MLATietz, 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.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.