APA

Que corporation, . (1990). Word perfect. Wilmington: Addison - Wesley.

Chicago

Que corporation, . 1990. Word perfect. Wilmington: Addison - Wesley.

Harvard

Que corporation, . (1990). Word perfect. Wilmington: Addison - Wesley.

MLA

Que corporation, . Word perfect. Wilmington: Addison - Wesley. 1990.