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Curtis, Glenn E. "The Warsaw Pact". Federal Research Division of the Library of Congress. Archived from the original on 26 February 2008. Retrieved 19 February 2008.
Dubček, Alexander (10 April 1968). "Akční program Komunistické strany Československa". Action Program (in Czech). Translated by Kramer, Mark; Moss, Joy; Tosek, Ruth. Rudé právo. pp. 1–6. Archived from the original on 6 May 2008. Retrieved 21 February 2008.
Derasadurain, Beatrice. "Prague Spring". thinkquest.org. Archived from the original on 14 November 2007. Retrieved 23 January 2008.
Dubček, Alexander (10 April 1968). "Akční program Komunistické strany Československa". Action Program (in Czech). Translated by Kramer, Mark; Moss, Joy; Tosek, Ruth. Rudé právo. pp. 1–6. Archived from the original on 6 May 2008. Retrieved 21 February 2008.
Derasadurain, Beatrice. "Prague Spring". thinkquest.org. Archived from the original on 14 November 2007. Retrieved 23 January 2008.
Curtis, Glenn E. "The Warsaw Pact". Federal Research Division of the Library of Congress. Archived from the original on 26 February 2008. Retrieved 19 February 2008.
Bahr, E. (1970). "Kafka and the Prague Spring". Mosaic: A Journal for the Interdisciplinary Study of Literature. 3 (4): 15–29. ISSN0027-1276. JSTOR24776229.