Gaya APA
Yohge, G, W. (1989).
Study guide to accompany samuelson-nordhaus economics (13th ed.).
New York:
McGraw-Hill Book Company.
Gaya MLA
Yohge, Gary, W..
"Study guide to accompany samuelson-nordhaus economics".
13th ed.
New York:
McGraw-Hill Book Company,
1989.
Text.