Books for Endgame Studies

"... Abstract themes and passive learning aren't necessarily bad. But whatever you learn has to be underlined in a more active way. Otherwise you will forget it, the way to you will forget trigonometry once you stop using sines and cosines. This is where practice comes in. Practice means playing games against humans and machines in various formats and time limits. When you get to apply - in a real game - what you've learned from a book or computer screen, the information is reinforced in a powerful way. ..." - GM Andrew Soltis (2009) 

"... The overwhelming majority of chess literature is about theory: opening theory, improvement theory, tactical ideas, how to think, etc. Good stuff. But the flip side to theory is practice. How good would you be at golf if you only took lessons and never played? … You need both theory and practice in tennis, golf, chess, math, or just about anything else. ..." - NM Dan Heisman (2002) https://web.archive.org/web/20140627052239/http://www.chesscafe.com/text/heisman16.pdf