Causa, O., & Cohen, D. (2006). The ladder of competitiveness: How to climb it. Development Centre of the Organisation for Economic Co-operation and Development.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Causa, Orsetta, و Daniel Cohen. The Ladder of Competitiveness: How to Climb It. Paris: Development Centre of the Organisation for Economic Co-operation and Development, 2006.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Causa, Orsetta, و Daniel Cohen. The Ladder of Competitiveness: How to Climb It. Development Centre of the Organisation for Economic Co-operation and Development, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.