Jordan, Edward; Balmain, Keith G. (1968). Electromagnetic Waves and Radiating Systems (2nd изд.). Prentice-Hall. стр. 100. „Faraday's Law, which states that the electromotive force around a closed path is equal to the negative of the time rate of change of magnetic flux enclosed by the path.”
Hayt, William (1989). Engineering Electromagnetics (5th изд.). McGraw-Hill. стр. 312. ISBN0-07-027406-1. „The magnetic flux is that flux which passes through any and every surface whose perimeter is the closed path.”