- (PDF) from the
original on
August 8, 2019. Silver, H. Ward (2008).
Circuitbuilding do-it-yourself for Dummies. For Dummies. p. 111. ISBN 0-470-17342-4...
- pp. 98–. ISBN 978-1-4020-7737-1. H. Ward
Silver (28
February 2008).
Circuitbuilding Do-It-Yourself For Dummies. John
Wiley & Sons. pp. 350–. ISBN 978-0-470-17342-8...