CIA’s Historical Review, Cold War era analysis (PDF), in Soviet – East European Military Relations in Historical Perspective Sources and Reassessments, vol. 1, n. 1, The Historical Collections Division (HCD) of the Office of Information Management Services, 24 ottobre 1997, pp. 18 of 44. URL consultato il 26 maggio 2014 (archiviato dall'url originale il 24 novembre 2013).