↑ Gottlieb, I.M., Practical RF power design techniques, TAB Books, 1993, ISBN 0-8306-4129-7, p.251 ('velocity factor') ↑ Velocity of Propagation, General Cable Australia Pty Ltd, retrieved 2010-02-13 ↑ "velocity of propagation" in Walker, P.M.B., Chambers Science and Technology Dictionary, Edinburgh, 1991, ISBN 1-85296-150-3 ↑ H. Ward Silver, N0AX, ed. (2011). "Chapter 22: Component Data and References".