Gaya APA
Essentials of economics. (2013).
Boston:
Pearson Education Int..
Gaya Chicago
Essentials of economics.
3rd ed..
Boston:
Pearson Education Int.,
2013.
Buku.
Gaya MLA
Essentials of economics.
3rd ed..
Boston:
Pearson Education Int.,
2013.
Buku.
Gaya Turabian
Essentials of economics.
Boston:
Pearson Education Int.,
2013.
Buku.