Gaya APA
Husted, S., Melvin, M. (1989).
International economics : Steven Husted, Michael Melvin .
New York:
Harper \r row.
Gaya MLA
Husted, Steven., Melvin, Michael.
"International economics : Steven Husted, Michael Melvin".
New York:
Harper \r row,
1989.
Buku.