Gaya APA
Britannica, . (2007).
The New Encyclopaedia Britannica Vol.18 (15th Edition).
United State:
John Wiley & Sons. Inc.
Gaya MLA
Britannica, .
"The New Encyclopaedia Britannica Vol.18".
15th Edition
United State:
John Wiley & Sons. Inc,
2007.
Encyclopaedia.