APA

A.A.V.V, . (1998). Population. Washington D.C: Rev. National Geographic.

Chicago

A.A.V.V, . 1998. Population. Washington D.C: Rev. National Geographic.

Harvard

A.A.V.V, . (1998). Population. Washington D.C: Rev. National Geographic.

MLA

A.A.V.V, . Population. Washington D.C: Rev. National Geographic. 1998.