Cullum, D. J. W. (1949). The practical application of acoustic principles. E. & F. N. Spon.
Dyfyniad Arddull ChicagoCullum, Douglas Jack Wayth. The Practical Application of Acoustic Principles. London: E. & F. N. Spon, 1949.
Dyfyniad MLACullum, Douglas Jack Wayth. The Practical Application of Acoustic Principles. E. & F. N. Spon, 1949.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.