APA

Samuelson P. A., Nordhaus W. D., . (1985). Economics. New York: McGraw-Hill Book Company.

Chicago

Samuelson Paul Anthony, Nordhaus William D, . 1985. Economics. New York: McGraw-Hill Book Company.

Harvard

Samuelson P. A., Nordhaus W. D., . (1985). Economics. New York: McGraw-Hill Book Company.

MLA

Samuelson Paul Anthony, Nordhaus William D, . Economics. New York: McGraw-Hill Book Company. 1985.