APA (7th ed.) Zitazioa

Black, J. D. (1959). Economics for agriculture: Selected writings. Harvard University Press.

Chicago Style (17th ed.) Zitazioa

Black, John Donald. Economics for Agriculture: Selected Writings. Cambridge: Harvard University Press, 1959.

MLA (9th ed.) Zitazioa

Black, John Donald. Economics for Agriculture: Selected Writings. Harvard University Press, 1959.