Johnson, D. G. (1973). World agriculture in disarray. London: MacMillan.
Chicago Style aipamenaJohnson, D. Gale. World Agriculture in Disarray. London: MacMillan, 1973.
MLA aipamenaJohnson, D. Gale. World Agriculture in Disarray. London: MacMillan, 1973.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.