Zahran, A.; Rahim, B.; Nofrianda, R. PENGARUH HARDINESS TERHADAP WORK ENGAGEMENT PADA KARYAWAN PT. TELKOM INDONESIA WITEL JAMBI: THE EFFECT OF HARDINESS ON WORK ENGAGEMENT IN OUTSOURCING EMPLOYEES OF PT TELKOM INDONESIA WITEL JAMBI. JPJ 2025, 9, 9-17.