APA استشهاد

Harcourt, G., & R H Wallace. (1967). Economic activity. Cambridge.

استشهاد بنمط شيكاغو

Harcourt, G.C, و R H Wallace. Economic Activity. London: Cambridge, 1967.

MLA استشهاد

Harcourt, G.C, و R H Wallace. Economic Activity. Cambridge, 1967.