Cita APA (7a ed.)

Ludwigson, J. (1972). Resources: Used and abused. United Nations.

Cita Chicago Style (17a ed.)

Ludwigson, John. Resources: Used and Abused. New York: United Nations, 1972.

Cita MLA (9a ed.)

Ludwigson, John. Resources: Used and Abused. United Nations, 1972.