Winarto, Sonden. “PENGHEMATAN ENERGI PADA SISTEM BOILER”. Swara Patra : Majalah Ilmiah PPSDM Migas 4, no. 2 (December 31, 2014). Accessed March 11, 2025. https://ejurnal.ppsdmmigas.esdm.go.id/sp/index.php/swarapatra/article/view/68.