Patti Warashina. Patti Warashina valentine to Robert Sperry, 1993 Feb. 14. Robert Sperry papers, 1951-2002. Archives of American Art, Smithsonian Institution.
Patti Warashina. Patti Warashina postcard to Robert Sperry, 1988 July 9. Robert Sperry papers, 1951-2002. Archives of American Art, Smithsonian Institution.