SAA, Stadsarchief Amsterdam, NA 418A/117, Nots: J. Jacobsz. Contract (Statement, Power of Attorney) of Jasper Varlet, Arent van de Cruijce, Jacques Hack, Jan van Bruck, Jacques Jacquesz van Ceulen.
SAA, Stadsarchief Amsterdam, NA 418A/117, Nots: J. Jacobsz. Contract (Statement, Power of Attorney) of Jasper Varlet, Arent van de Cruijce, Jacques Hack, Jan van Bruck, Jacques Jacquesz van Ceulen.