Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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