Kabir, S., A. B. M. T. Hossain, and K. F. Kiang. “Premature Idiopathic Costochondral Calcification: A Case Report”. Borneo Journal of Medical Sciences (BJMS), vol. 11, no. 1, Apr. 2017, pp. 32-37, doi:10.51200/bjms.v11i1.636.