Dyfyniad APA

Lipsey, R. G., Steiner, P. O., & Purvis, D. D. (1987). Economics (8th ed.). JMC Press.

Dyfyniad Arddull Chicago

Lipsey, Richard G., Peter Otto Steiner, and Douglas D. Purvis. Economics. 8th ed. Quezon City: JMC Press, 1987.

Dyfyniad MLA

Lipsey, Richard G., et al. Economics. 8th ed. JMC Press, 1987.

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