Gaya APA
Britannica, . (2007).
The New Encyclopaedia Britannica in 32 Volumes (15th Edition).
United State:
Encyclopaedia Britannica.
Gaya MLA
Britannica, .
"The New Encyclopaedia Britannica in 32 Volumes".
15th Edition
United State:
Encyclopaedia Britannica,
2007.
Encyclopaedia.