Gregg, J. R., Fries, A. C., Rowe, M. F., & Travis, D. L. (1968). Applied secretarial practice (6th ed.). Gregg Division, McGraw-Hill.
Chicago Style (17. basım) AtıfGregg, John Robert, Albert C. Fries, Margaret Forcht Rowe, ve Dorothy L. Travis. Applied Secretarial Practice. 6th ed. New York: Gregg Division, McGraw-Hill, 1968.
MLA (8th ed.) AtıfGregg, John Robert, et al. Applied Secretarial Practice. 6th ed. Gregg Division, McGraw-Hill, 1968.
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