Dyfyniad APA

Lipsey, R. G. (1975). Introduction to positive economics (4th ed.). ELBS & Waidenfeld and Nicoson.

Dyfyniad Arddull Chicago

Lipsey, Richard G. Introduction to Positive Economics. 4th ed. ELBS & Waidenfeld and Nicoson, 1975.

Dyfyniad MLA

Lipsey, Richard G. Introduction to Positive Economics. 4th ed. ELBS & Waidenfeld and Nicoson, 1975.

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