Gaya APA
Pengetahuan Umum. (2006).
:
Quality Press.
Gaya Chicago
Pengetahuan Umum.
.
:
Quality Press,
2006.
Non-fiction.
Gaya MLA
Pengetahuan Umum.
.
:
Quality Press,
2006.
Non-fiction.
Gaya Turabian
Pengetahuan Umum.
:
Quality Press,
2006.
Non-fiction.