http://www.kunsthaus.ch/en/library/digital-library/catalogues-raisonnes-and-critical-editions/?redirect_url=title%3DM%D0%A0%C2%A0%D0%B2%D0%201a%D1%161%D0%A0%E2%20ac%2122%D0%2019%C2%A9thodolog

Kunsthaus Zürich

Catalogues Raisonnés and Critical Editions

Gogh, Vincent van

Vincent van Gogh: The letters

The Vincent van Gogh Gallery

Goya y Lucientes, Francisco José ¬de¬

Info Goya

Nussbaum, Felix

Felix Nussbaum Werkverzeichnis

Picasso, Pablo

Online Picasso Project

Whistler, James McNeill

The correspondance of James McNeill Whistler