John, M., C., M., F.(1993).Study guide to accompany Lipsey, Courant, Purvis, Steiner : economics / Fredric C. Menz, John Mutti (Ed.ke-10).New York:Harpercollins College Publishers.
Gaya MLA
Mutti, John., Menz, Fredric, C.."Study guide to accompany Lipsey, Courant, Purvis, Steiner : economics / Fredric C. Menz, John Mutti".Ed.ke-10New York:Harpercollins College Publishers,1993.Skripsi.