I have some resources for ancient Greek and Roman Sorcery:
Also Ancient and Traditional Witchcraft are very different things, if you want Traditional Roman or Greek Witchcraft that is going to be a lot more recent. I provided Ancient materials, message me again if you wanted more recent Traditional Witchcraft material for the last 1000 years or so.
I am not having tons of luck on Greek traditional witchcraft. For the most part that would be written by Greeks, and its entirely unsafe for them last I heard to be open at all about even Wicca let alone any kind of traditional craft. As for Rome, that would fall under Italian traditional witchcraft, and my favorite resources for that are:
The Gospel of Aradia by Charles Leland
Bypaths in Sicily by Eliza Putnam
Nightbattles and Ecstacies both by Carlos Ginzburg
Also books by Claude Leceutoux are excellent resources as well for continential witchcraft.