Nasution, A., O. Sidjabat, A. Haris, and M. Morina. “PROSES REFORMASI KATALITIK”. Swara Patra : Majalah Ilmiah PPSDM Migas, vol. 1, no. 2, Dec. 2011, http://ejurnal.ppsdmmigas.esdm.go.id/sp/index.php/swarapatra/article/view/93.