Middle Game Planning

Take a look at these books: http://www.chess.com/eq/chess+books/winning-chess-tactics-revised2
http://www.chess.com/eq/chess+books/winning-chess-strategies-revised2
For something a bit more advanced you could try these:http://www.chess.com/eq/chess+books/modern-chess-strategy2
http://www.chess.com/eq/chess+books/art-of-attack-in-chess-revised-algebraic-edition2
How can I improve my middle game?
This weekend I was in a tournament I had this great position, but I fumbled because of my lack of planning. Is there any book or video I can look into?