H.J Mukono, Haryanto Notopuro, Muliyadi, , trans. 2015. “Effects Of Blood Lead, Smoking Habits And Nutritional Status Toward Cystatin C Serum”. International Journal of Scientific Research and Management (IJSRM) 3 (7): 3266-69. https://ijsrm.net/index.php/ijsrm/article/view/142.