Παραπομπή APA
Griesinger, F. K. (1974). How to cut costs and improve service of your telephone, telex, TWX, and other telecommunications. New York: McGraw-Hill.
Παραπομπή Chicago StyleGriesinger, Frank K. How to Cut Costs and Improve Service of Your Telephone, Telex, TWX, and Other Telecommunications. New York: McGraw-Hill, 1974.
Παραπομπή MLAGriesinger, Frank K. How to Cut Costs and Improve Service of Your Telephone, Telex, TWX, and Other Telecommunications. New York: McGraw-Hill, 1974.
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