D. Damaruci, N. H. Kurniawan, H. Wiyanto, and E. S. A. Wijaya, “Understanding and Accepting Employee Coopetition Paradox: Effects on Work Motivation and Job Happiness”, j. of economics, entrepreneurship, manag. bus. and account., vol. 4, no. 6, pp. 134–151, Oct. 2026.