Vigor, P. (1971). Books on communism and the communist countries. London: Ampersand.
Citazione stile Chigago Style (17a edizione)Vigor, P.H. Books on Communism and the Communist Countries. London: Ampersand, 1971.
Citatione MLA (8a ed.)Vigor, P.H. Books on Communism and the Communist Countries. London: Ampersand, 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.