POLKA, Dave. Motors and drives: a practical technology guide. Research Triangle Park, NC: ISA, ©2003. ISBN 9781601193315. Dostupné také z: https://proxy.k.utb.cz/login?url=https://app.knovel.com/hotlink/toc/id:kpMDAPTG09/motors-and-drives?kpromoter=marc.