*[http://www.marxists.org/archive/lenin/works/1921/oct/13sh.htm Vladimir I. Lenin to Sidney Hillman], Lenin Collected Works, Progress Publishers, 1976, Moscow, Volume 35, pages 526-527.
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*[http://foia.fbi.gov/foiaindex/louislepkebuchalter.htm Louis "Lepke" Buchalter], FBI FOIA file.
*[http://foia.fbi.gov/foiaindex/louislepkebuchalter.htm Louis "Lepke" Buchalter], FBI FOIA file.