APA (7th ed.) Zitazioa

Harcourt, G. A. o. (1967). Economic activity. C.U.P.

Chicago Style (17th ed.) Zitazioa

Harcourt, G.C. And others. Economic Activity. Cambridge: C.U.P, 1967.

MLA (9th ed.) Zitazioa

Harcourt, G.C. And others. Economic Activity. C.U.P, 1967.