HENDERSON, J. V., POOLE, W., & PARISH, A. E. (1991). Student workbook for principles of economics. D.C. Heath and Company.
Chicago-čujuhus (17. p.)HENDERSON, J. Vernon, William POOLE, juo Albert E. PARISH. Student Workbook for Principles of Economics. Lexington: D.C. Heath and Company, 1991.
MLA-čujuhus (9. p.)HENDERSON, J. Vernon, et al. Student Workbook for Principles of Economics. D.C. Heath and Company, 1991.
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