Lancaster, D. (1975). Active-filter cookbook.
Lua i Stíl Chicago (17ú heag.)Lancaster, Don. Active-filter Cookbook. Indianapolis : H. W. Sams, 1975.
Lua MLA (9ú heag.)Lancaster, Don. Active-filter Cookbook. 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.