Hanson, R. N., Johnson, J. E., Ober, S., & Rice, A. (2003). Gregg college keyboarding & document processing (9th ed.). Boston: McGraw-Hill.
Παραπομπή Chicago StyleHanson, Robert N., Jack E. Johnson, Scot Ober, και Arlence Rice. Gregg College Keyboarding & Document Processing. 9th ed. Boston: McGraw-Hill, 2003.
Παραπομπή MLAHanson, Robert N., Jack E. Johnson, Scot Ober, και Arlence Rice. Gregg College Keyboarding & Document Processing. 9th ed. Boston: McGraw-Hill, 2003.
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