Cita APA (7th ed.)

SAMUELSON, P. A. (1967). Economics an introductory analysis. McGraw-Hill.

Cita Chicago (17th ed.)

SAMUELSON, Paul A. Economics an Introductory Analysis. New York: McGraw-Hill, 1967.

Cita MLA (9th ed.)

SAMUELSON, Paul A. Economics an Introductory Analysis. McGraw-Hill, 1967.