System Identification Theory For The User

Pearson

System Identification: Theory for the User      

Faber & Faber

Simulation Theory                                

Boosey & Hawkes

Theory Fun Factory 1: Music Theory Puzzles and Games

Boosey & Hawkes

Theory Fun Factory 2: Music Theory Puzzles and Games

Music Sales Amer

Theory & Harmony for the Contemporary Musician  

Boosey & Hawkes

The complete theory fun factory vol. 1-3        

Measure theory (The University series in higher mathematics)