Lizzi, F. New Developments in Ultrasonic Transducers and Transducer Systems. SPIE Digital Library.
Chicago-viite (17. p.)Lizzi, Frederick. New Developments in Ultrasonic Transducers and Transducer Systems. SPIE Digital Library.
MLA-viite (9. p.)Lizzi, Frederick. New Developments in Ultrasonic Transducers and Transducer Systems. SPIE Digital Library.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.