Lobies, J.-P. IBN: Index bio-bibliographicus notorum hominum, 1972- pars C, v. 37, p. 505 (Claesz, Cornelis; b. ca. 1546, Brabant; d. 1609, Amsterdam; surname variants: Classen, Claessonius, Claeszoon, Clauszohn, Nicolai, Nicolas; x-refs: Nes, Cornelis van; Van Nes, Cornelis)
BL STC Low Countries, 1475-1600 p. 225 (Claesz, Cornelis; publisher, active Amsterdam 1582-1600)
Veer, G. Vraye description de trois voyages de mer tres admirables, 1609 t.p. (chez Cornille Nicolas)
BN Bonacini Berlin. Ornamentstichsammlung National biografisch woordenboek.