Gaya APA
Asimov, Isaac. (1992).
secret of the unverse .
Oxford:
Oxford University Press.
Gaya Chicago
Asimov, Isaac.
secret of the unverse.
Oxford:
Oxford University Press,
1992.
Text.
Gaya MLA
Asimov, Isaac.
secret of the unverse.
Oxford:
Oxford University Press,
1992.
Text.
Gaya Turabian
Asimov, Isaac.
secret of the unverse.
Oxford:
Oxford University Press,
1992.
Print.