Gaya APA

Eisch, M, A. (1991). WordPerfect 5.0/5.1 : A Practical Approach (International Student Edition). Ohio: South Western Publishing.Co.

Gaya MLA

Eisch, Mary, Alice. "WordPerfect 5.0/5.1 : A Practical Approach". International Student Edition Ohio: South Western Publishing.Co, 1991. Text.