Onisimus Amtu, S L Souisa, L S Joseph and P C Lumamuly, "Contribution of Leadership, Organizational Commitment and Organizational Culture to Improve the Quality of Higher Education," IJI, vol IX no1, pp 131-157, 2021.
Sjeny Liza Souisa, Onisimus Amtu and Lourine Since Joseph, "Implementation of Teacher Metacognition to Improve the Quality of Christian Religious Learning in Schools," EMSJ: European Modern Studies Journal, vol. 4, no. 6, pp. 1-9, 2020.
Onisimus Amtu, Korlina Makulua, Jacoba Matital and Claudia Monique Pattiruhu, "Improving Student Learning Outcomes through School Culture, Work Motivation and Teacher Performance" IJI: International Journal of Instruction, vol 13 no 4, pp. 885-902, 2020.
Christiana Demaja Wilhelmina Sahertian, Onisimus Amtu and Rukhama Aralaha, "Improving Student Cooperation Skills Using the Jigsaw and Stad Model," Journal of Critical Reviews, vol. 7, no. 14, pp. 229-234, 2020.
Pitersina Christina Lumamuly, "CULTURAL BASED EDUCATION: Tangkole Contribution to the Teaching of Christian Religious Education," in A PROCEEDING: ISSUES IN RESEARCH AND THEIR INTERNATIONAL PUBLICATION STAKPN Tarutung, Tarutung, Maret 2017.