John C. Bogle
Books
Books by or about the investor and the investing style.
Books to read
Read books about John C. Bogle to learn method, not to find a guaranteed formula. A good book should improve how you ask questions, check evidence, and control risk.
Start with primary sources or classics related to the style.
Write down 3 principles you can use in your own portfolio.
Do not copy mechanically if your context is different.