1. A step-by-step active-filter design
2. The Biquad: Part I-Some practical design considerations
3. G. Daryanani, Principles of Active Network Synthesis and Design (Wiley, 1976) pp. 339–358.
4. M. S. Ghausi and K. R. Laker, Modern Filter Design, Active RC and Switched Capacitor (Prentice Hall, Engelwood Cliffs, NJ, 1981) pp. 226–227.
5. M. E. Van Valkenburg, Analog Filter Design (Holt Rinehart and Winston, 1982) pp. 136–137.