Lua APA (7ú heag.)

Key, V. O. (1958). Politics, parties and pressure groups (4th ed.). Crowell.

Lua i Stíl Chicago (17ú heag.)

Key, Valdimer Orlando. Politics, Parties and Pressure Groups. 4th ed. New York: Crowell, 1958.

Lua MLA (9ú heag.)

Key, Valdimer Orlando. Politics, Parties and Pressure Groups. 4th ed. Crowell, 1958.

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