Kahl, B. (1982). C 520 D: 3-Digit-Analog/Digital-Wandler.
Lua i Stíl Chicago (17ú heag.)Kahl, B. C 520 D: 3-Digit-Analog/Digital-Wandler. Frankfurt/Oder, 1982.
Lua MLA (8ú heag.)Kahl, B. C 520 D: 3-Digit-Analog/Digital-Wandler. 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.