APA

Samuelson P. A., . (1967). Economics: an introductory analysis. New York: McGraw-Hill.

Chicago

Samuelson Paul Anthony, . 1967. Economics: an introductory analysis. New York: McGraw-Hill.

Harvard

Samuelson P. A., . (1967). Economics: an introductory analysis. New York: McGraw-Hill.

MLA

Samuelson Paul Anthony, . Economics: an introductory analysis. New York: McGraw-Hill. 1967.