I've heard Thomas McEvilley mentioned as a good source for the link between pre-Socratic philosophy and India. https://www.amazon.com/The-Shape-Ancient-Thought

I've heard Thomas McEvilley mentioned as a good source for the link between pre-Socratic philosophy and India. https://www.amazon.com/The-Shape-Ancient-Thought-Philosophies/dp/1581152035/ https://www.amazon.com/The-Shape-Ancient-Thought-Philosophie...