Mahfud, M., N. Rizali, E. Antriyandarti, and S. Ani. “Competitive Strategy of Tie-Dyed Cloth Smes in Facing the Existence of Batik Cloth in Yogyakarta City”. Journal of Research in Business, Economics and Management, Vol. 7, no. 1, Sept. 2016, pp. 1020-3, http://scitecresearch.com/journals/index.php/jrbem/article/view/894.