Hanson Rice, & Johnson Ober. (2000). Gregg College Keyboarding and Document Processing: Lessons 61-120, By Ober, 9th Edition. American: McGraw Hill/Irwin.
Chicago Style aipamenaHanson Rice, và Johnson Ober. Gregg College Keyboarding and Document Processing: Lessons 61-120, By Ober, 9th Edition. American: McGraw Hill/Irwin, 2000.
MLA aipamenaHanson Rice, và Johnson Ober. Gregg College Keyboarding and Document Processing: Lessons 61-120, By Ober, 9th Edition. American: McGraw Hill/Irwin, 2000.
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