2 best books on price action day trading/scalping are by bob volman. if one completely understands and study these 2 books day trading price action becomes profitable and enjoyable.
1) Forex Price Action Scalping: An In-Depth Look into the Field of Professional Scalping. (must and first to study ).
2) Understanding Price Action: Practical Analysis of the 5-Minute Time Frame.
the first book is more than sufficient to be profitable. both the books are costly but worth the investment, particularly first book.