Clenardi Epistolarum libri duo (Antwerp, 1566), from the house of Plantin; Victor Chauvin and Alphonse Roersch, "Etude sur la vie et les travaux de Nicolas Clenard" in Mémoires couronnes (vol. lx., 1900–1901) of the Royal Academy of Belgium, which contains information on Cleynaerts and an extensive bibliography of his works.