Gaya APA
Why? people: stephen hawking. (2014).
Indonesia:
Elex Media Komputindo.
Gaya Chicago
Why? people: stephen hawking.
.
Indonesia:
Elex Media Komputindo,
2014.
Text.
Gaya MLA
Why? people: stephen hawking.
.
Indonesia:
Elex Media Komputindo,
2014.
Text.
Gaya Turabian
Why? people: stephen hawking.
Indonesia:
Elex Media Komputindo,
2014.
Print.