Gaya APA
Sampson, R, J., Marienhoff, I. (1983).
The American Economy: Analysis Issues Principles .
U.S.A:
Houghton Mifflin Company.
Gaya MLA
Sampson, Roy, J.., Marienhoff, Ira.
"The American Economy: Analysis Issues Principles".
U.S.A:
Houghton Mifflin Company,
1983.
Book.