Bach, G, L. (1970). Economics : an introduction to analysis and policy (2nd ed.). Englewodd Cliffs, NJ: Prentice-Hall, c.
Bach, George, Leland. "Economics : an introduction to analysis and policy". 2nd ed. Englewodd Cliffs, NJ: Prentice-Hall, c, 1970. Buku Umum.