^Hirsch, Donald; Kett, Joseph F.; Trefil, James S., The New Dictionary of Cultural Literacy, Houghton Mifflin Harcourt, 316, 2002, 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, 65, 2003, ISBN81-7890-071-8, "the countries of Eastern Europe under communism"
^对比： Janzen, Jörg; Taraschewski, Thomas. Shahshahānī, Suhaylā, 编 (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."