VanZante, Neal R., George R. Wagman, and Ralph B. Fritzsch. “Practical Guidance For Including A Roth 401 (K) In Your Retirement Investment Portfolio”. Journal of Business & Economics Research (JBER) 6, no. 9 (September 1, 2008). Accessed July 17, 2024. https://clutejournals.com/index.php/JBER/article/view/2468.