Samuelson, P. A., Watkins, M. H., Staiger, D. S., Robinson, R., & Baldwin, G. B. (1958). Instructor's manual and answer key to study guide and workbook: To accompany Samuelson Economics fourth edition. McGraw-Hill.
Παραπομπή σε μορφή Chicago (17η εκδ.)Samuelson, Paul Anthony, Melville H. Watkins, David S. Staiger, Romney Robinson, και George B. Baldwin. Instructor's Manual and Answer Key to Study Guide and Workbook: To Accompany Samuelson Economics Fourth Edition. New York: McGraw-Hill, 1958.
Παραπομπή σε μορφή MLA (9th εκδ.)Samuelson, Paul Anthony, et al. Instructor's Manual and Answer Key to Study Guide and Workbook: To Accompany Samuelson Economics Fourth Edition. McGraw-Hill, 1958.
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