SIMATUPANG, S.; ALDIANSAH, F. E.; MANURUNG, H. M.; PUTRA, H. S.; INDAJANG, K. Power Nap: The Secret Of A Simple 20-Minute Investment That Supports Employee Work Productivity. International Journal of Economics, Business and Innovation Research, v. 5, n. 02, p. 533-544, 11 Mar. 2026.