APA Style
Planet Earth. (2003).
Great Britain:
Encyclopedia Britannica.
Chicago Style
Planet Earth.
.
Great Britain:
Encyclopedia Britannica,
2003.
Book.
MLA Style
Planet Earth.
.
Great Britain:
Encyclopedia Britannica,
2003.
Book.
Turabian Style
Planet Earth.
Great Britain:
Encyclopedia Britannica,
2003.
Book.