Cita APA (7a ed.)
Poulsen, T. M. (1995). Nations and states: A geographic background to world affairs. Prentice Hall.
Cita Chicago Style (17a ed.)
Poulsen, Thomas M. Nations and States: A Geographic Background to World Affairs. Englewood Cliffs, N.J.: Prentice Hall, 1995.
Cita MLA (9a ed.)
Poulsen, Thomas M. Nations and States: A Geographic Background to World Affairs. Prentice Hall, 1995.
Precaución: Estas citas no son 100% exactas.