American Historical Print Collectors Society. Encourages the collection, preservation, study, and exhibition of original historical American prints that are 100 or more years old.

The Grolier Club. America's oldest and largest society for bibliophiles and enthusiasts in the graphic arts.

The Bookdealer Interviews. Sheila Markham

ABC for Book Collectors (classic glossary, 8th ed., ILAB). Downloadable text

Il libro antico. Angela Nuovo, Aldo Coletto and Graziano Ruffini

Private Libraries in Renaissance England (PLRE) Folger database

HENRIK: Books and their Owners in Finland to 1809. Finnish Lit. Soc. & Project Henrik. Database