Sari, Adika, 		Lestari, Rina, 		Sansprayada, Arfan, 		Desriyani, Desriyani, AND 		Rosmita, Rosmita.
" SISTEM INFORMASI PENJUALAN HELM DENGAN MENGGUNAKAN METODE WATERFALL" <em>Journal of Information System, Applied, Management, Accounting and Research</em> [Online], Volume 3 Number 3 (13 August 2019)