Check out, `Sacrifice and Initiative in Chess`, by Ivan Sokolov. It's also available as an interactive E book through the Forward Chess app on Android. The app itself is a free download, and you can download a free preview of the book which shows the complete table of contents.
exchange sacrifices

Essential Chess Sacrifices - David Lemoir - Covers the 15 most standard piece sacrifices, typically a Knight or Bishop.
Understanding the Sacrifice - Angus Dunnington - Covers various themes of sacrifices, like sacrificing to remove a guard, surrendering say, a pawn, merely to destroy all scope of an opponent's piece, like maybe the WK is on g1, you sacrifice a pawn on f4, resulting in a White, blocked pawn on f4 with his bishop on h2 and your pawn on h4, so you gave up a pawn or piece on f4 to hem in his Bishop on h2
Positional Chess Sacrifices - Suba - The first 80% of the book is themed by Opening with 50 to 100 extra pages on random stuff related to sacrifices.
I'm sure there are others, but those 3 come to mind off the top of my head.
Grandmaster Chess Strategy
http://www.amazon.com/Grandmaster-Chess-Strategy-Anderssons-Masterpieces/dp/9056913468
Improve Your Chess Pattern Recognition
http://www.amazon.com/Improve-Your-Chess-Pattern-Recognition/dp/905691538X
Petrosian Move by Move
what is a good book or other information source to learn about positional exchange sacrifices? I don't mean the standard stuff like Rxc3 in a Dragon, or Rxf6 vs. a king side castled position.