APA Style

Samuelson, Paul A.. (1989). Economics 13th ed. (13th ed.). New York: Mc Graw Hill.

Chicago Style

Samuelson, Paul A.. Economics 13th ed.. 13th ed. New York: Mc Graw Hill, 1989. Text.

MLA Style

Samuelson, Paul A.. Economics 13th ed.. 13th ed. New York: Mc Graw Hill, 1989. Text.

Turabian Style

Samuelson, Paul A.. Economics 13th ed.. 13th ed. New York: Mc Graw Hill, 1989. Print.