Hertzoff, I. (1995). AT & T global messaging: The AT & T EasyLink services sourcebook. New York: McGraw-Hill, Inc..
Παραπομπή Chicago StyleHertzoff, Ira. AT & T Global Messaging: The AT & T EasyLink Services Sourcebook. New York: McGraw-Hill, Inc., 1995.
Παραπομπή MLAHertzoff, Ira. AT & T Global Messaging: The AT & T EasyLink Services Sourcebook. New York: McGraw-Hill, Inc., 1995.
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