Christensen, D. A. (1988). Ultrasonic bioinstrumentation. Wiley.
Lua i Stíl Chicago (17ú heag.)Christensen, Douglas A. Ultrasonic Bioinstrumentation. New York: Wiley, 1988.
Lua MLA (9ú heag.)Christensen, Douglas A. Ultrasonic Bioinstrumentation. Wiley, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.