Dyfyniad APA

Samuelson. Paula & William D. Nordhaus. (2010). Economics (Nineteenth Edition.). The Mc Graw Hill.

Dyfyniad Arddull Chicago

Samuelson. Paula and William D. Nordhaus. Economics. Nineteenth Edition. New York: The Mc Graw Hill, 2010.

Dyfyniad MLA

Samuelson. Paula and William D. Nordhaus. Economics. Nineteenth Edition. The Mc Graw Hill, 2010.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.