Gaya APA

1). Samuelson, Paul. A, 2). Nordhaus, William. D. (2010). ECONOMICS. 2010 (nineteenth edition). New York: McGraw-Hill,.

Gaya Chicago

1). Samuelson, Paul. A, 2). Nordhaus, William. D. ECONOMICS. 2010. nineteenth edition New York: McGraw-Hill,, 2010. Printed Book.

Gaya MLA

1). Samuelson, Paul. A, 2). Nordhaus, William. D. ECONOMICS. 2010. nineteenth edition New York: McGraw-Hill,, 2010. Printed Book.

Gaya Turabian

1). Samuelson, Paul. A, 2). Nordhaus, William. D. ECONOMICS. 2010. nineteenth edition New York: McGraw-Hill,, 2010. Printed Book.