Gaya APA

Samuelson, P, A., Nordhaus, W, D. (1998). Macroeconomics : a version of economics . New York: Mc. Grow-Hill.

Gaya MLA

Samuelson, Paul., A.., Nordhaus, William, D.. "Macroeconomics : a version of economics". New York: Mc. Grow-Hill, 1998. Text.