APA Style
Kirk,Ellen. (2012).
Human Footprint .
Washington, D.C.:
National Geographic.
Chicago Style
Kirk,Ellen.
Human Footprint.
Washington, D.C.:
National Geographic,
2012.
Book.
MLA Style
Kirk,Ellen.
Human Footprint.
Washington, D.C.:
National Geographic,
2012.
Book.
Turabian Style
Kirk,Ellen.
Human Footprint.
Washington, D.C.:
National Geographic,
2012.
Book.