Dyfyniad APA

Guffey, M. E. (1998). Professional writer's electronic resource. Version 1.0. Disk 3-4 (version 1.0.). Cincinnati, OH: South-Western College.

Dyfyniad Arddull Chicago

Guffey, Mary Ellen. Professional Writer's Electronic Resource. Version 1.0. Disk 3-4. version 1.0. Cincinnati, OH: South-Western College, 1998.

Dyfyniad MLA

Guffey, Mary Ellen. Professional Writer's Electronic Resource. Version 1.0. Disk 3-4. version 1.0. Cincinnati, OH: South-Western College, 1998.

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