Poulsen, T. M., & Sharkov, D. (1995). Nations and states: A geographic background to world affairs. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Poulsen, Thomas M., agus Dimitry Sharkov. Nations and States: A Geographic Background to World Affairs. Englewood Cliffs, N.J: Prentice Hall, 1995.
Lua MLA (9ú heag.)Poulsen, Thomas M., agus Dimitry Sharkov. Nations and States: A Geographic Background to World Affairs. Prentice Hall, 1995.
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