HARAHAP, N. .; SIREGAR, A. Z. .; KANSRINI, Y. . Analysis of The State of Educative Workers in Polytechnic of Agricultural (STPP) Lecturers Based on Empirical Data in Sumatera Utara. Jurnal Online Pertanian Tropik, [S. l.], v. 6, n. 2, p. 227–237, 2019. DOI: 10.32734/jopt.v6i2.3158. Disponível em: https://idjpcr.usu.ac.id/jpt/article/view/3158. Acesso em: 4 aug. 2025.