Hia, A. K., A. Komariah, D. A. Kurniady, and S. Sumarto. “Commencing Self Directed Learning to Heutagogy Skill in Lieu of Spiritual Entrepreneurship”. International Journal of Management Excellence (ISSN: 2292-1648), vol. 11, no. 3, Oct. 2018, pp. 1650-5, doi:10.17722/ijme.v11i3.1031.