Gaya APA
Explorations : stars, galaxies, and planets. (2004).
New York:
[s.n.].
Gaya Chicago
Explorations : stars, galaxies, and planets.
Cet. 2.
New York:
[s.n.],
2004.
Text.
Gaya MLA
Explorations : stars, galaxies, and planets.
Cet. 2.
New York:
[s.n.],
2004.
Text.
Gaya Turabian
Explorations : stars, galaxies, and planets.
New York:
[s.n.],
2004.
Print.