توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Engen, E. M., & Gale, W. G. (2000). The effects of 401(k) plans on household wealth: Differences across earnings groups. National Bureau of Economic Research.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Engen, Eric M., و William G. Gale. The Effects of 401(k) Plans on Household Wealth: Differences Across Earnings Groups. Cambridge: National Bureau of Economic Research, 2000.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Engen, Eric M., و William G. Gale. The Effects of 401(k) Plans on Household Wealth: Differences Across Earnings Groups. National Bureau of Economic Research, 2000.