Entries are approximatly ordered by their importance/influence on how I implemented various sig classes.
Dodge, Charles and Thomas Jerse. Computer Music: Synthesis, Composition, and Performance. New York: Schirmer Books; 1985.
Steiglitz, Ken. A Digital Signal Processing Primer. New York: Addison-Wesley; 1996. pp. 113-119. [TK5102.9.S74]
Roads, Curtis. The Computer Music Tutorial. Cambridge, Massachusetts: MIT Press; 1996. pp. 417-418. [MT56.R6 1995]
Oppenheim, Alan V. and Ronald W. Schafer, Discrete-Time Signal Processing. Englewood Cliffs, New Jersey: Prentice Hall; 1989. pp.234-240. [TK5102.5.02452 1989]
Winsor, Phil and Gene DeLisa. Computer Music in C. Blue Ridge Summit, Pennsylvania: TAB Books; 1991. pp. 177-205.
Here are some books which are or seem useful, but I haven't gotten around to reading/implementing from them.
Rorabaugh, C. Britton. Digital Filter Designer's Handbook with C++ Algorithms. New York: McGraw-Hill; 1997. [TK7878.F5R68 1997] [ISBN 0-07-053806-9 (hc)]
Messick, Paul. Maximum MIDI: Music Applications in C++. Greenwich, Connecticutt: Manning Publications Co.; 1998. [MT723.M48 1997] [ISBN 1-884777-44-9].
Tranter, Jeff. Linux Multimedia Guide. Sebastopol, California: O'Reilly & Assoiciates; 1996. [ISBN 1-56592-219-0]