Cita APA (7th ed.)

Samuelson, P. A., & Robinson, R. (1961). Study guide and workbook to accompany Samuelson: Economics (5a. ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Samuelson, Paul Anthony, i Romney Robinson. Study Guide and Workbook to Accompany Samuelson: Economics. 5a. ed. Nueva York: McGraw-Hill, 1961.

Cita MLA (9th ed.)

Samuelson, Paul Anthony, i Romney Robinson. Study Guide and Workbook to Accompany Samuelson: Economics. 5a. ed. McGraw-Hill, 1961.