Samuelson, P. A., Kruizenga, R. J., Robinson, R., & Baldwin, G. B. (1955). Instructor's manual and answer key to student workbook: To accompany Economics an introductory analysis. McGraw-Hill.
Παραπομπή σε μορφή Chicago (17η εκδ.)Samuelson, Paul Anthony, Richard J. Kruizenga, Romney Robinson, και George B. Baldwin. Instructor's Manual and Answer Key to Student Workbook: To Accompany Economics an Introductory Analysis. New York: McGraw-Hill, 1955.
Παραπομπή σε μορφή MLA (9th εκδ.)Samuelson, Paul Anthony, et al. Instructor's Manual and Answer Key to Student Workbook: To Accompany Economics an Introductory Analysis. McGraw-Hill, 1955.
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