APA

Acerson K. L., . (1990). WordPerfect 5.1: the complete reference. New York: Osborne McGraw-Hill.

Chicago

Acerson Karen L, . 1990. WordPerfect 5.1: the complete reference. New York: Osborne McGraw-Hill.

Harvard

Acerson K. L., . (1990). WordPerfect 5.1: the complete reference. New York: Osborne McGraw-Hill.

MLA

Acerson Karen L, . WordPerfect 5.1: the complete reference. New York: Osborne McGraw-Hill. 1990.