Erickson, E., & Hinshaw, E. (1966). An introduction to economics: Student workbook (2nd ed.). Allyn and Bacon.

Erickson, Edward, and Elton Hinshaw. An Introduction to Economics: Student Workbook. 2nd ed. Boston: Allyn and Bacon, 1966.

Erickson, Edward, and Elton Hinshaw. An Introduction to Economics: Student Workbook. 2nd ed. Allyn and Bacon, 1966.