The best accessible archaeology reference I can recommend is "The Horse, the Wheel, and Language", and that book can guide you to many other resources.(https://press.princeton.edu/books/paperback/9780691148182/th...)

Though the research is a tad dated since we have more genetic evidence since it was written, and there are many disputes about the author's assertions about the timing of the advent of horse riding, it still stands up very well. AFAIK the genetic research made since the book's publication has only strengthened his archaeological and linguistic arguments.