* Harvey Klehr, John Earl Haynes, and Kyrill Anderson, ''The Soviet World of American Communism'' (New Haven: Yale University Press, 1998). ISBN 0300071507
* Harvey Klehr, John Earl Haynes, and Kyrill Anderson, ''The Soviet World of American Communism'' (New Haven: Yale University Press, 1998). ISBN 0300071507
*[http://www.fas.org/irp/ops/ci/docs/ci1/chap4.pdf A Counterintelligence Reader], Vol. 2, Chap. 4, National Counterintelligence Center (NACIC).
*[http://www.fas.org/irp/ops/ci/docs/ci1/chap4.pdf A Counterintelligence Reader], Vol. 2, Chap. 4, National Counterintelligence Center (NACIC).
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*[[Allen Weinstein]], ''The Haunted Wood: Soviet Espionage in America—the Stalin Era'' coauthored with Alexander Vassiliev, (New York: Random House, 1999).
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*[[Allen Weinstein]], ''The Haunted Wood: Soviet Espionage in America—the Stalin Era'' coauthored with [[Alexander Vassiliev]], (New York: Random House, 1999).