Richardson, E. (1953). Sound: A physical text-book (5th ed.). ELBS.
Dyfyniad Arddull ChicagoRichardson, E.G. Sound: A Physical Text-book. 5th ed. London: ELBS, 1953.
Dyfyniad MLARichardson, E.G. Sound: A Physical Text-book. 5th ed. ELBS, 1953.
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