Gaya APA
Essentials of Economics. (sa).
Boston:
Mc Graw Hill.
Gaya Chicago
Essentials of Economics.
5th.
Boston:
Mc Graw Hill,
sa.
Buku.
Gaya MLA
Essentials of Economics.
5th.
Boston:
Mc Graw Hill,
sa.
Buku.
Gaya Turabian
Essentials of Economics.
Boston:
Mc Graw Hill,
sa.
Buku.