Gaya APA
Explorations An Introduction to Astronomy. (2006).
New York:
[s.n.].
Gaya Chicago
Explorations An Introduction to Astronomy.
.
New York:
[s.n.],
2006.
Text.
Gaya MLA
Explorations An Introduction to Astronomy.
.
New York:
[s.n.],
2006.
Text.
Gaya Turabian
Explorations An Introduction to Astronomy.
New York:
[s.n.],
2006.
Print.