Παραπομπή σε μορφή APA (7η εκδ.)

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.

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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