"Roses". The Collection. Washington, DC: National Gallery of Art. 2011. Archived from the original on September 6, 2016. Retrieved March 21, 2011.
"Roses - Provenance". The Collection. Washington, DC: National Gallery of Art. 2011. Archived from the original on September 4, 2016. Retrieved March 21, 2011.
web.archive.org
"Roses". The Collection. Washington, DC: National Gallery of Art. 2011. Archived from the original on September 6, 2016. Retrieved March 21, 2011.
"Roses - Provenance". The Collection. Washington, DC: National Gallery of Art. 2011. Archived from the original on September 4, 2016. Retrieved March 21, 2011.