Ulc, O. (1974). Politics in Czechoslovakia. W. H. Freeman.
Lua i Stíl Chicago (17ú heag.)Ulc, Otto. Politics in Czechoslovakia. San Francisco: W. H. Freeman, 1974.
Lua MLA (8ú heag.)Ulc, Otto. Politics in Czechoslovakia. W. H. Freeman, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.