Gultom, Ester Lusia, Henni Sitompul, and Kimura Patar Tamba. 2019. “GURU KRISTEN SEBAGAI PENUNTUN BELAJAR SISWA KELAS XII DI SATU SEKOLAH KRISTEN [CHRISTIAN TEACHERS AS GUIDES TO LEARNING FOR GRADE 12 STUDENTS AT ONE CHRISTIAN SCHOOL]”. JOHME: Journal of Holistic Mathematics Education 3 (1):63-79. https://doi.org/10.19166/johme.v3i1.1966.