Gaya APA

Ober, S. et al (2002). Gregg College Keyboarding Lesson 1-20 (5). Illinois: McGraw-Hill Glencoe.

Gaya MLA

Ober, Scot. et al. "Gregg College Keyboarding Lesson 1-20". 5 Illinois: McGraw-Hill Glencoe, 2002. Text.