APA (7th ed.) Citation

Lockhart, S. D. (2020). Tutorial guide to AutoCAD 2021. SDC Publications.

Chicago Style (17th ed.) Citation

Lockhart, Shawna D. Tutorial Guide to AutoCAD 2021. Mission, Kansas: SDC Publications, 2020.

MLA (9th ed.) Citation

Lockhart, Shawna D. Tutorial Guide to AutoCAD 2021. SDC Publications, 2020.