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