O'Keeffe, G. (1987). Georgia O'Keeffe, art and letters. National Gallery of Art.
Cita Chicago (17th ed.)O'Keeffe, Georgia. Georgia O'Keeffe, Art and Letters. Washington: National Gallery of Art, 1987.
Cita MLA (9th ed.)O'Keeffe, Georgia. Georgia O'Keeffe, Art and Letters. National Gallery of Art, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.