O'Keeffe, G. (1987). Georgia O'Keeffe, art and letters. National Gallery of Art.
Lua i Stíl Chicago (17ú heag.)O'Keeffe, Georgia. Georgia O'Keeffe, Art and Letters. Washington: National Gallery of Art, 1987.
Lua MLA (9ú heag.)O'Keeffe, Georgia. Georgia O'Keeffe, Art and Letters. National Gallery of Art, 1987.
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