  Oleg D. Jefimenko's electrodynamics textbook is unique in its approaches to
deriving the electric and magnetic fields of arbitrary charge and current
distributions, and those of an arbitrarily moving point charge. However, an
uncommon form of the inhomogeneous wave equations used in the early steps often
poses difficulty for readers right from the beginning. In this paper, we
substitute in a commonly used form, making his approaches readily accessible.
