Here's my personal list of middlegame books to get plus books I have. Many were taken from suggestions on chess.com, in other threads.
1001 Brilliant Chess Sacrifices and Combinations - Fred Reinfeld
Can You Be a Positional Chess Genius - Angus Dunnington
Chess Strategy in Action - John Watson
Chess Tactics For Advanced Players - Yuri Averbakh
Complete Chess Strategy 1 (First Principles of the Middle Game) - Ludek Pachman
Complete Chess Strategy 2 (Principles of Pawn Play and the Center) - Ludek Pachman
Complete Chess Strategy 3 (Play on the Wings) - Ludek Pachman
Dynamic Pawn Play in Chess - Marovic
Grandmaster Chess Move by Move - John Nunn
How to Reassess Your Chess - Jeremy Silman
Improve Your Chess Now - Jonathan Tisdall
Judgment and Planning in Chess - Euwe
Lasker's Manual of Chess - Emanuel Lasker
Middlegame Planning - Romanovsky
Modern Chess Stategy - Ludek Pachman
My 60 Memorable Games - Bobby Fischer
My System - Aron Nimzowitsch
New Ideas in Chess - Larry Evans
Pawn Power in Chess - Hans Kmoch
Pawn Structure Chess - Andrew Soltis
Planning in Chess - Janos Flesch
Positional Ideas in Chess - John Love
Secret of Grandmaster Play - John Nunn & Peter Griffiths
Secrets of Modern Chess Strategy - John Watson
Secrets Of Practical Chess - John Nunn
Tactics in the French - Gennardy Nesis
The Art of Attack in Chess - Vladimir Vukovic
The Art of the Middle Game - Keres & Kotov
The Briliant Touch in Chess - Walter Korn
The Middlegame 1 (Static Features) - Euwe & Kramer
The Middlegame 2 (Dynamic & Subjective Features) - Euwe & Kramer
The Middlegame in Chess - Eugene Znosko-Borovsky
Think Like a Grandmaster - Alexander Kotov
Understanding Chess Middlegames - John Nunn
Understanding Chess Move by Move - John Nunn
Understanding Chess Tactics - Martin Weteschnik
Understanding Pawn Play in Chess - Drazen Marovic
Winning Chess Brilliancies - Yasser Seirawan
Winning Chess Combinations - Yasser Seirawan
Winning Pawn Structures - Alexander Baburin
Zurich International Chess Tournament 1953 - David Bronstein
BTW: When I said Wham, I meant it as in it would surprise people, not offend them in anyway.