Robinson, R. (1976). Study guide to accompany. Samuelson: Economics (10a. ed.). McGraw-Hill.
Tohutoru Kātū Chicago (17th ed.)Robinson, Romney. Study Guide to Accompany. Samuelson: Economics. 10a. ed. Nueva York: McGraw-Hill, 1976.
Tohutoro MLA (9th ed.)Robinson, Romney. Study Guide to Accompany. Samuelson: Economics. 10a. ed. McGraw-Hill, 1976.
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