Gaya APA
Frank, , R, H. (2009).
Principles of economics : brief edition / Robert H. Frank, Ben S. Bernanke .
Bandung:
Gramedia.
Gaya MLA
Frank, , Robert, H..
"Principles of economics : brief edition / Robert H. Frank, Ben S. Bernanke".
Bandung:
Gramedia,
2009.
Text.