APA aipamena

Samuelson Paul & Nordhaus, W. D. (2012). Economics (19th.). Tata McGraw Hill.

Chicago Style aipamena

Samuelson Paul and William D. Nordhaus. Economics. 19th. Chennai: Tata McGraw Hill, 2012.

MLA aipamena

Samuelson Paul and William D. Nordhaus. Economics. 19th. Tata McGraw Hill, 2012.