Gaya APA
Carl Sagan, Aun Druyan. (1934).
COMET .
USA:
Random House,New York.
Gaya Chicago
Carl Sagan, Aun Druyan.
COMET.
USA:
Random House,New York,
1934.
Text.
Gaya MLA
Carl Sagan, Aun Druyan.
COMET.
USA:
Random House,New York,
1934.
Text.
Gaya Turabian
Carl Sagan, Aun Druyan.
COMET.
USA:
Random House,New York,
1934.
Print.