Nainggolan, Desi Sonia Petlin, et al. “Pengaruh Program Pertukaran Mahasiswa Terhadap Rasa Toleransi Mahasiswa Universitas HKBP Nommensen Medan”. Innovative: Journal Of Social Science Research, vol. 3, no. 2, May 2023, pp. 3335-42, https://j-innovative.org/index.php/Innovative/article/view/725.