Aubin, Chantal. "French Counterintelligence and British Secret Intelligence in the Netherlands, 1920-40." In Battleground Western Europe: Intelligence Operations in Germany and The Netherlands in the Twentieth Century, eds. Beatrice de Graaf, Ben de Jong, and Wies Platje, 17-47. Amsterdam: Het Spinhuis, 2007.
Spence, Richard B. "The Strange Case of Sergius Riis." International Journal of Intelligence and Counterintelligence 15, no. 2 (Summer 2002): 222-242.
This is an interesting if often speculative article about a man who, as the author concludes, "managed to keep himself employed -- and alive -- through some three decades of clandestine work, no mean achievement."
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