Authors:

No blue without yellow and without orange, and if you do blue, then do yellow and orange as well, surely.

Leo Jansen, Vincent van Gogh, Émile Bernard, Hans Luijten, Nienke Bakker (2007). “Vincent Van Gogh: painted with words : the letters to Émile Bernard”, Rizzoli
No blue without yellow and without orange, and if you do blue, then do yellow and orange as well, surely.