APA (7th ed.) Citation

Simpson, A. (1993). Mastering WordPerfect 6. Sybex.

Chicago Style (17th ed.) Citation

Simpson, Alan. Mastering WordPerfect 6. San Francisco: Sybex, 1993.

MLA (9th ed.) Citation

Simpson, Alan. Mastering WordPerfect 6. Sybex, 1993.

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