Dyfyniad APA

Harcourt, G., Karmel, P., & Wallace, R. H. (1968). Economic activity. Cambridge University Press.

Dyfyniad Arddull Chicago

Harcourt, G.C, P.H Karmel, and R. H. Wallace. Economic Activity. London: Cambridge University Press, 1968.

Dyfyniad MLA

Harcourt, G.C, et al. Economic Activity. Cambridge University Press, 1968.

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