APA Style
Britannica Learning Library : Planet Earth. (2003).
Chicago:
Encyclopaedia Britannica.
Chicago Style
Britannica Learning Library : Planet Earth.
.
Chicago:
Encyclopaedia Britannica,
2003.
Text.
MLA Style
Britannica Learning Library : Planet Earth.
.
Chicago:
Encyclopaedia Britannica,
2003.
Text.
Turabian Style
Britannica Learning Library : Planet Earth.
Chicago:
Encyclopaedia Britannica,
2003.
Print.