APA

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

Chicago

Samuelson Paul A, . 1967. Economics. New York: McGraw-Hill.

Harvard

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

MLA

Samuelson Paul A, . Economics. New York: McGraw-Hill. 1967.