O'Keeffe, G., Cowart, J., & Hamilton, J. (1987). Georgia O'Keeffe, art and letters. National Gallery of Art.
Chicagoスタイル(17版)引用形式O'Keeffe, Georgia, Jack Cowart, , Juan Hamilton. Georgia O'Keeffe, Art and Letters. Washington: National Gallery of Art, 1987.
MLA(9版)引用形式O'Keeffe, Georgia, et al. Georgia O'Keeffe, Art and Letters. National Gallery of Art, 1987.
警告: この引用は必ずしも正確ではありません.