APA
Clifford S. H., Sawyer S. C. j. a. & Coulthard G. J. j. a. (1994). WordPerfect 6.0A for Windows. Burr Ridge, Ill: Irwin.
Chicago
Clifford Sarah Hutchinson, Sawyer Stacey C joint author and Coulthard Glen J joint author. 1994. WordPerfect 6.0A for Windows. Burr Ridge, Ill: Irwin.
Harvard
Clifford S. H., Sawyer S. C. j. a. and Coulthard G. J. j. a. (1994). WordPerfect 6.0A for Windows. Burr Ridge, Ill: Irwin.
MLA
Clifford Sarah Hutchinson, Sawyer Stacey C joint author and Coulthard Glen J joint author. WordPerfect 6.0A for Windows. Burr Ridge, Ill: Irwin. 1994.