Reddit reviews Young Justice (2011-2013) Vol. 4: Invasion

Here are Amazon links for the digital editions because the physical copies have been out of print for several years and have gotten really expensive.

Young Justice Vol. 1

Young Justice Vol. 2: Training Day

Young Justice Vol. 3: Creature Features

Young Justice Vol. 4: Invasion

Those are (unfortunately) all of the comics that actually tie-in with the show. There is a Young Justice comic series that ran in he late 90s that is also good, but has nothing to do with the show. If you're itching for more comics in this same vein though, I'd check out that 90s Young Justice comic I mentioned and Geoff Johns's Teen Titans run from the early 2000s as they're both phenomenal.

Young Justice: Invasion tie-in comic covers what happened.

https://www.amazon.com/Young-Justice-Vol-4-Invasion-ebook/dp/B00GSCORH6/ref=sr_1_2?ie=UTF8&qid=1538027710&sr=8-2&keywords=young+justice+tie+in