subject of choices for independent units, see John David Jackson. Classicalelectrodynamics Third. New York: Wiley. 1998: 154 [2015-03-07]. ISBN 0-471-30932-X
Griffiths, David J. Introduction to Electrodynamics, ISBN 0-13-805326-X and Jackson, John D. ClassicalElectrodynamics, ISBN 0-471-30932-X. Transactions