I only know that stuff because I coincidentally did some research into the place a few months ago. I imagine that the site is covered in some archaeological books covering Roman Syria, or dealing with Canaanite or Roman religion but I didn't find one with a quick search of the library I have access to and I didn't look further than that. I think there is a book published from the results of the original excavations around 1900, but it's in German.
The woodcuts I posted above are from an English language book though - "The Ruins of Balbec, otherwise Heliopolis in Coelosyria" by Robert Wood. You can find a full copy on Archive.org. It's really just a bunch of pictures and explanatory notes though.
I get most of my info by reading around online, finding a semi-relevant paper on google scholar, and then following chains of references, but that's not much help unless you have access to a library with journal subscriptions unfortunately.
I've had difficulty in finding comprehensive English language sources for stuff in the middle east before. A lot of published material is in Arabic, French, or German often without an English translation available.