Gaya APA
Step Into History. (2000).
London:
Prentice Hall.
Gaya Chicago
Step Into History.
2000.
London:
Prentice Hall,
2000.
Text.
Gaya MLA
Step Into History.
2000.
London:
Prentice Hall,
2000.
Text.
Gaya Turabian
Step Into History.
London:
Prentice Hall,
2000.
Print.