For Rockefeller, there is Ron Chernow's. There is also this book : The Tycoons: How Andrew Carnegie, John D. Rockefeller, Jay Gould, and J. P. Morgan Invented

For Rockefeller, there is Ron Chernow's. There is also this book : The Tycoons: How Andrew Carnegie, John D. Rockefeller, Jay Gould, and J. P. Morgan Invented the American Supereconomy Reprint Edition, Kindle Edition by Charles R. Morris Links: https://www.amazon.com/Titan-Life-John-Rockefeller-Sr-ebook/dp/B000XUDGHG/ https://www.amazon.com/Titan-Life-John-Rockefeller-Sr-ebook/... https://www.amazon.com/Andrew-Carnegie-David-Nasaw-ebook/dp/B000XCQ4A0/ https://www.amazon.com/Andrew-Carnegie-David-Nasaw-ebook/dp/... https://www.amazon.com/Tycoons-Carnegie-Rockefeller-Invented-Supereconomy-ebook/dp/B003JH86HU/ https://www.amazon.com/Tycoons-Carnegie-Rockefeller-Invented...