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Dyfyniad Arddull ChicagoSonde, B. S. Transducers and Display Systems. New Delhi: Tata McGraw-Hill, 1977.
Dyfyniad MLASonde, B. S. Transducers and Display Systems. Tata McGraw-Hill, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.