Markus Lüpertz, Atelier, c. 1973–74, Tempera and crayon on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33981

Markus Lüpertz, Snail and Shovel, 1976, Pastel on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33993

Markus Lüpertz, [Untitled], 1980, Charcoal, gouache, and chalk on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35763