I've been researching these cultural echoes of the Proto Indo-Europeans online for some time now; it's fascinating that over a billion people (Catholics, etc.) use roughly the same term 'Deus Pater' to describe their supreme deity up through the modern day without full cognizance of the concept's historical roots. Sky father worship may be the most highly conserved human cultural idea of all time.

Do you have any suggestions for reading material (ideally academic in book form) that covers the archaeological and/or linguistic reconstruction research in depth?