The principles you learn from a classic remain valid, but technology has evolved. After mastering the book, consider these modern overlays:
Essential for "purists" who want to understand the indicator's birth. It is more of a technical manual than a strategy guide, featuring hand-calculated worksheets. RSI: The Complete Guide by John Hayden
by J. Welles Wilder Jr.: Though not exclusively about RSI, this is the foundational 1978 text where Wilder first introduced the indicator to the world. Technical Reports & Academic Studies
The book argued that the default 14-period setting was a trap for retail traders. Inside the PDF were backtested tables for different assets: RSI(5) for volatile crypto, RSI(21) for smooth ETFs, and RSI(50) for weekly position trading. Each strategy came with a screenshot—a PDF-friendly visual of exactly where to enter and exit.