HAMAD, Munir M. AutoCAD 2021 beginning and intermediate. Dulles, Virginia: Mercury Learning and Information, [2020]. ISBN 9781683925200. Dostupné také z: https://proxy.k.utb.cz/login?url=https://app.knovel.com/hotlink/toc/id:kpACADBI23/autocad-2021-beginning?kpromoter=marc.