Gaya APA
Sagan, Carl, Druyan, Ann. (1985).
Comet .
New York:
Random House.
Gaya Chicago
Sagan, Carl, Druyan, Ann.
Comet.
New York:
Random House,
1985.
Buku.
Gaya MLA
Sagan, Carl, Druyan, Ann.
Comet.
New York:
Random House,
1985.
Buku.
Gaya Turabian
Sagan, Carl, Druyan, Ann.
Comet.
New York:
Random House,
1985.
Buku.