Barr, A., & Packard, T. (2005). Seeking solutions to vulnerability in old age: Preferences, constraints, and alternatives for coverage under Peru’s pension system. CSAE (University of Oxford).
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Barr, A., و T. Packard. Seeking Solutions to Vulnerability in Old Age: Preferences, Constraints, and Alternatives for Coverage Under Peru’s Pension System. CSAE (University of Oxford), 2005.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Barr, A., و T. Packard. Seeking Solutions to Vulnerability in Old Age: Preferences, Constraints, and Alternatives for Coverage Under Peru’s Pension System. CSAE (University of Oxford), 2005.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.