Siddhi, Maya Purnama, et al. “The Effect of Work Motivation on the Work Productivity of Account Officers at PT Permodalan Nasional Madani (Persero), Jakarta Regional 5 Branch. Undergraduate Thesis. Management Study Program, Universitas Panca Sakti Bekasi 2026”. Indonesian Journal Economic Review (IJER), vol. 6, no. 3, Sept. 2026, pp. 1455-62, https://doi.org/10.59431/ijer.v6i3.996.