1. Hemphill RE : The illness of Vincent van Gogh. Proc R Soc Med 1961, 54: 1083–88.
2. Lee TC : van Gogh's vision: digitalis intoxication? J Am Med Assn 1981, 245: 727–9.
3. The complete letters of Vincent van Gogh. 2nd ed. Boston, New York Graphics Society, 1978.
4. de la Faille JB : The works of Vincent van Gogh: his paintings and drawings. New York, Reynal & Co, 1970.
5. Pickvance R : van Gogh in Aries. New York. Metropolitan Museum of Art, 1984.