APA (7th ed.) Citation

Göckel, H. (1990). WordPerfect 5.1. Hüthig.

Chicago Style (17th ed.) Citation

Göckel, Harald. WordPerfect 5.1. Heidelberg: Hüthig, 1990.

MLA (9th ed.) Citation

Göckel, Harald. WordPerfect 5.1. Hüthig, 1990.

Warning: These citations may not always be 100% accurate.