"Le Père Tanguy". L'Écho de Paris (in French). 13 February 1894. Retrieved 29 November 2012.
books.google.com
Meier-Graefe, J (1987) [London: Michael Joseph, Ltd. 1936]. Vincent Van Gogh: A Biography. Mineola, NY, USA: Dover Publications. pp. 56–57There are other pages that also provide background about van Gogh's evolution since coming to Paris, such as pages 68, 77{{cite book}}: CS1 maint: postscript (link)
Gill, W (November 2, 1962). "Strange Story of Walter Chrysler Jr. Art Scandal". Life Magazine. 53 (18). Time, Inc.: 80–83. Retrieved March 19, 2011The painting owned by Stavros Niarchos, the Greek shipping magnate, is noted by the tree bark to the left of his face, the flower just below the tree and the manner in which his face, shirt and jacket were painted.{{cite journal}}: CS1 maint: postscript (link)