Wordperfect Corporation. (1989). WordPerfect Office for IBM personal computers. WordPerfect Corporation.
Cita Chicago Style (17a ed.)Wordperfect Corporation. WordPerfect Office for IBM Personal Computers. Utah: WordPerfect Corporation, 1989.
Cita MLA (9a ed.)Wordperfect Corporation. WordPerfect Office for IBM Personal Computers. WordPerfect Corporation, 1989.
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