ALDY HIMAWAN NUARI S, and UMI CHOTIJAH. “PENERAPAN METODE WATERFALL PADA SISTEM INFORMASI PELAYANAN JASA UJI LABORATORIUM KIMIA”. JURNAL EKONOMI, SOSIAL & HUMANIORA, Vol. 5, no. 02, Oct. 2023, pp. 1-6, https://jurnalintelektiva.com/index.php/jurnal/article/view/990.