Indo-European Myth and Religion: A Manual

His books aren't cheap but Roger Woodard is the man here - https://www.amazon.com/Indo-European-Myth-Religion-Roger-Woodard/dp/0757590608 https://www.amazon.com/Indo-European-Sacred-Space-Vedic-Traditions/dp/0252029887 https://www.amazon.com/Fetch-Some-Golden-Apples/dp/0757521606 https://www.amazon.com/Ritual-Warrior-Roman-Indo-European-Antiquity/dp/1107022401/