DAHL, R. A. (1991). Modern Plotical Analysis Robert A. Dahl. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)DAHL, Robert A. Modern Plotical Analysis Robert A. Dahl. Prentice Hall, 1991.
Lua MLA (8ú heag.)DAHL, Robert A. Modern Plotical Analysis Robert A. Dahl. Prentice Hall, 1991.
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