Dyfyniad APA

Lipsey, R. G. (1963). An introduction to positive economics. London: Weidenfeld and Nicolson.

Dyfyniad Arddull Chicago

Lipsey, Richard G. An Introduction to Positive Economics. London: Weidenfeld and Nicolson, 1963.

Dyfyniad MLA

Lipsey, Richard G. An Introduction to Positive Economics. London: Weidenfeld and Nicolson, 1963.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.