International League of Antiquarian Booksellers  http://www.ilab-lila.com

The Library of Congress http://www.loc.gov/homepage/lchp.html

 The Print Council of America http://www.printcouncil.org

Yale University Library Catalog http://www.orbis.library.yale.edu

 The British Library http://www.bl.uk

 Oxford University Library http://www.lib.ox.ac.uk

 Istituto Centrale per il catalogo unico http://www.iccu.sbn.it

 Delineavit et Sculpsit http://www.delineavit.nl

Galleria Falteri http://www.falteri.it

Il BulinoStampe Antiche http://www.matteocrespi.com