For some sources, here's two good threads[0][1] on /r/AcademicBiblical, which is strictly moderated with secular scholar rigor, and a video[2] linked in one of those threads by Dr Ian Mills at Duke University. If you're interested in an analysis of the intended meaning of the passage, there's more in those links.
[0]https://old.reddit.com/r/AcademicBiblical/comments/136pdmc/w...
[1]https://www.reddit.com/r/AcademicBiblical/comments/5xwjgd/wh...
I am intrigued to learn more about how Roman currency was managed in Judea at that time. As far as I know Jewish law did forbid carrying coinage with images of the emperor, but obviously many Jewish pilgrims to the temple had to exchange some kind of currency for shekels.