Darwis, Darwis, 		Matondang, Sofiyan, AND 		Sianturi, Marudut.
" THE EFFECT OF WORK DISCIPLINE AND WORK MOTIVATION ON EMPLOYEE WORK ACHIEVEMENT AT EDUCATION OFFICE OF NORTH SUMATERA PROVINCE" <em>JURNAL PROINTEGRITA</em> [Online], Volume 5 Number 1 (15 June 2020)