Vigor, P. (1971). Books on communism and the communist countries. London: Ampersand.
Lua i Stíl Chicago (17ú heag.)Vigor, P.H. Books on Communism and the Communist Countries. London: Ampersand, 1971.
Lua MLA (8ú heag.)Vigor, P.H. Books on Communism and the Communist Countries. London: Ampersand, 1971.
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