Gaya APA
Singgih. (2015).
Never too young to become a billionaire .
Jakarta:
Elex Media Komputindo.
Gaya Chicago
Singgih.
Never too young to become a billionaire.
Jakarta:
Elex Media Komputindo,
2015.
Text.
Gaya MLA
Singgih.
Never too young to become a billionaire.
Jakarta:
Elex Media Komputindo,
2015.
Text.
Gaya Turabian
Singgih.
Never too young to become a billionaire.
Jakarta:
Elex Media Komputindo,
2015.
Print.