Roberto Aizenberg, [Untitled], 1966, Colored pencil and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38091

Roberto Aizenberg, [Untitled], 1967–68, Pencil and colored pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38093