Peter W. Sperlich. Oppression and Scarcity: The History and Institutional Structure of the Marxist-Leninist Government of East Germany and Some Perspectives on Life in a Socialist System. Westport, CT: Greenwood Publishing Group. 2006. p. 46.
Richard Felix Staar. Communist Regimes in Eastern Europe. Fifth Edition. California: Hoover Institution Press. 1988. p. 104.