^Hirsch, Donald; Kett, Joseph F.; Trefil, James S., The New Dictionary of Cultural Literacy, Houghton Mifflin Harcourt. 2002: 316, ISBN0-618-22647-8, "Eastern Bloc. The name applied to the former communist states of eastern Europe, including Yugoslavia and Albania, as well as the countries of the Warsaw Pact"
^Satyendra, Kush, Encyclopaedic dictionary of political science, Sarup & Sons. 2003: 65, ISBN81-7890-071-8, ""the countries of Eastern Europe under communism""
^对比： Janzen, Jörg; Taraschewski, Thomas. Shahshahānī, Suhaylā (编). Cities of Pilgrimage. Iuaes-series 4. Münster: LIT Verlag. 2009. 190 |pages=或|at=多余 (帮助)[2012-12-21]. ISBN9783825816186. "Until 1990, despite being a formally independent state, Mongolia had de facto been an integral part of the Soviet dominated Eastern Bloc."