APA

Samuelson P. A., Nordhaus W. D., . (2005). Economics. New York: McGraw-Hill / Irwin.

Chicago

Samuelson P A, Nordhaus W D, . 2005. Economics. New York: McGraw-Hill / Irwin.

Harvard

Samuelson P. A., Nordhaus W. D., . (2005). Economics. New York: McGraw-Hill / Irwin.

MLA

Samuelson P A, Nordhaus W D, . Economics. New York: McGraw-Hill / Irwin. 2005.