[1] KENJO Takanashi, Stepping motors and their microprocessor controls. Oxford 1985, 239 s., ISBN- 0-19-859339-2
[2] EDWIN,W.: Applied Robotics. PROMPT Publications by Howard W.Sams. 312 pp.,1999. USA. ISBN 0?7906?1184-8
[3] Neil Sclater, Nicholas Chironis. Mechanisms and Mechanical Devices Sourcebook, McGraw-Hill Education; 5 edition, 560 pp., August 12, 2011, ISBN-13: 978-0071704427