Pakpahan, Muchtar, AND 		Situmorang, Eddy.
" ANALISIS EFISIENSI MULTI FUEL BOILER DAN PENGARUH AIR HEATER TERHADAP PENINGKATAN EFISIENSI MULTI FUEL BOILER  PT TOBA PULP LESTARI, Tbk KAPASITAS 200 TON/JAM" <em>Jurnal Teknologi Mesin UDA</em> [Online], Volume 2 Number 1 (30 June 2021)