Ritson, C., & Harvey, D. (1997). The common agricultural policy (2nd ed.). CAB International.
Lua i Stíl Chicago (17ú heag.)Ritson, Christopher, agus David Harvey. The Common Agricultural Policy. 2nd ed. New York, NY: CAB International, 1997.
Lua MLA (9ú heag.)Ritson, Christopher, agus David Harvey. The Common Agricultural Policy. 2nd ed. CAB International, 1997.