Gaya APA
The Physical Universe. (2006).
New York:
[s.n.].
Gaya Chicago
The Physical Universe.
.
New York:
[s.n.],
2006.
Text.
Gaya MLA
The Physical Universe.
.
New York:
[s.n.],
2006.
Text.
Gaya Turabian
The Physical Universe.
New York:
[s.n.],
2006.
Print.