Gaya APA

Samuel, P, A., Nordhaus, W, D. (2005). Economics (ed.18cet.1). Amerika: Mc Graw Hill Lange.

Gaya MLA

Samuel, Paul, A.., Nordhaus, William, D.. "Economics". ed.18cet.1 Amerika: Mc Graw Hill Lange, 2005. Buku Teks.