APA

Clason K., Hansen D., . (1990). WordPerfect Office: The Complete Reference. New York: Osbone McGram-Hill.

Chicago

Clason K, Hansen D, . 1990. WordPerfect Office: The Complete Reference. New York: Osbone McGram-Hill.

Harvard

Clason K., Hansen D., . (1990). WordPerfect Office: The Complete Reference. New York: Osbone McGram-Hill.

MLA

Clason K, Hansen D, . WordPerfect Office: The Complete Reference. New York: Osbone McGram-Hill. 1990.