Gaya APA
Management. (2012).
Boston:
Pearson Education Int..
Gaya Chicago
Management.
11th ed..
Boston:
Pearson Education Int.,
2012.
Buku.
Gaya MLA
Management.
11th ed..
Boston:
Pearson Education Int.,
2012.
Buku.
Gaya Turabian
Management.
Boston:
Pearson Education Int.,
2012.
Buku.