Ober Scot, E.Johnson Jack, Rice Arlene, & N.Hanson Robert. (2002). Gregg College Keyboarding & Document Processing (GDP), Lessons 1-60, Student Text (Gregg College Keyboarding & Document Processing for Windows) (Paperback). American: McGraw Hill/Irwin.
Παραπομπή Chicago StyleOber Scot, E.Johnson Jack, Rice Arlene, και N.Hanson Robert. Gregg College Keyboarding & Document Processing (GDP), Lessons 1-60, Student Text (Gregg College Keyboarding & Document Processing for Windows) (Paperback). American: McGraw Hill/Irwin, 2002.
Παραπομπή MLAOber Scot, E.Johnson Jack, Rice Arlene, και N.Hanson Robert. Gregg College Keyboarding & Document Processing (GDP), Lessons 1-60, Student Text (Gregg College Keyboarding & Document Processing for Windows) (Paperback). American: McGraw Hill/Irwin, 2002.