Gregory B. Keen et C. T. Odhner, « Professor C. T. Odhner's Account of Willem Usselincx and the South, Ship, and West India Companies of Sweden », The Pennsylvania Magazine of History and Biography, vol. 7, no 3, , p. 268–270 (ISSN0031-4587, lire en ligne, consulté le )
jstor.org
Gregory B. Keen et C. T. Odhner, « Professor C. T. Odhner's Account of Willem Usselincx and the South, Ship, and West India Companies of Sweden », The Pennsylvania Magazine of History and Biography, vol. 7, no 3, , p. 268–270 (ISSN0031-4587, lire en ligne, consulté le )
knaw.nl
pure.knaw.nl
(en) I. J. A. Nijenhuis, « Trading information: Willem Usselincx (1567-1647) in the corridors of power », Information and power in history: Towards a global approach, , p. 54–68 (lire en ligne, consulté le )