Chapman, S. J. (1923). Elementary economics (Fifth impression.). Longmans, Green and Co..
Dyfyniad Arddull ChicagoChapman, Sidney John. Elementary Economics. Fifth impression. London : New York, [etc.]: Longmans, Green and Co., 1923.
Dyfyniad MLAChapman, Sidney John. Elementary Economics. Fifth impression. Longmans, Green and Co., 1923.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.