Gaya APA

Samuelson, P, A., Nordhaus, W, D. (1989). Microeconomics : a version of economics (edisi 13). amerika: Mc Graw Hill publishing company.

Gaya MLA

Samuelson, Paul, A., Nordhaus, William, D. "Microeconomics : a version of economics". edisi 13 amerika: Mc Graw Hill publishing company, 1989. Text.