Gustman, A. L., & Steinmeier, T. L. (1998). Changing pensions in cross-section and panel data: Analysis with employer provided plan descriptions. National Bureau of Economic Research.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gustman, Alan L., و Thomas L. Steinmeier. Changing Pensions in Cross-section and Panel Data: Analysis with Employer Provided Plan Descriptions. Cambridge: National Bureau of Economic Research, 1998.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Gustman, Alan L., و Thomas L. Steinmeier. Changing Pensions in Cross-section and Panel Data: Analysis with Employer Provided Plan Descriptions. National Bureau of Economic Research, 1998.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.