Gaya APA
Sagan, Carl. (2013).
Cosmos .
New York:
Ballantine Books.
Gaya Chicago
Sagan, Carl.
Cosmos.
New York:
Ballantine Books,
2013.
Text.
Gaya MLA
Sagan, Carl.
Cosmos.
New York:
Ballantine Books,
2013.
Text.
Gaya Turabian
Sagan, Carl.
Cosmos.
New York:
Ballantine Books,
2013.
Print.