Gaya APA

Ober, S, O, S. (2002). Gregg college keyboarding & document processing lesson 1- 60.-- (Ed. 9.--). America: McGraw-Hill.

Gaya MLA

Ober, Scot., Ober,, Scot.. "Gregg college keyboarding & document processing lesson 1- 60.--". Ed. 9.-- America: McGraw-Hill, 2002. Buku.