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"The speed of light in vacuum is constant in all inertial reference frames".

But "Classical Dynamics" by Jerry B. Marion has:

"The velocity of light in free space is a universal constant independent of any relative motion of the source and observer".

I think there is no need of inertial frame, i.e c would be the same for any observer and source, even if is in an accelerating spaceship doing the measuring. If it is so, then I think those texts are doing a great injustice to students as the notion of inertial frame, in itself, has deep and difficult implications.