Ritson, C., & Harvey, D. (1997). The common agricultural policy (2nd ed.). CAB International.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ritson, Christopher, و David Harvey. The Common Agricultural Policy. 2nd ed. New York, NY: CAB International, 1997.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Ritson, Christopher, و David Harvey. The Common Agricultural Policy. 2nd ed. CAB International, 1997.