A.R Habbo, Dr., and Mr.H.S Hammodi. “The Effect Of Adding Ethanol To Leaded Gasoline on The Performance of Spark Ignition Engine”. Al-Rafidain Engineering Journal (AREJ) 18, no. 4 (August 1, 2010): 33–43. Accessed October 2, 2025. https://jcis.uomosul.edu.iq/index.php/arej/article/view/31200.