APA
Samuelson P. A. &. N. W. D., . (2012). Economics 9th ed. New Delhi: Tata McGraw hill edu prvt ltd.
Chicago
Samuelson Paul A & Nordhaus William D, . 2012. Economics 9th ed. New Delhi: Tata McGraw hill edu prvt ltd.
Harvard
Samuelson P. A. &. N. W. D., . (2012). Economics 9th ed. New Delhi: Tata McGraw hill edu prvt ltd.
MLA
Samuelson Paul A & Nordhaus William D, . Economics 9th ed. New Delhi: Tata McGraw hill edu prvt ltd. 2012.