Παραπομπή APA
Ellenbogen, A. (1978). Letter perfect: A business person's guide to more effective correspondence (Rev. and updated ed. of The Collier quick and easy guide to business letter writing.). New York: Collier Books.
Παραπομπή Chicago StyleEllenbogen, Abraham. Letter Perfect: A Business Person's Guide to More Effective Correspondence. Rev. and updated ed. of The Collier quick and easy guide to business letter writing. New York: Collier Books, 1978.
Παραπομπή MLAEllenbogen, Abraham. Letter Perfect: A Business Person's Guide to More Effective Correspondence. Rev. and updated ed. of The Collier quick and easy guide to business letter writing. New York: Collier Books, 1978.
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