Cita APA (7a ed.)
O'Keeffe, G., Cowart, J., Hamilton, J., & Greenough, S. Georgia O'Keeffe: Art and Letters. National Gallery of Art.
Cita estilo Chicago (17a ed.)
O'Keeffe, Georgia, Jack Cowart, Juan Hamilton, y Sarah Greenough. Georgia O'Keeffe: Art and Letters. Washington, D.C., EUA: National Gallery of Art.
Cita MLA (9a ed.)
O'Keeffe, Georgia, et al. Georgia O'Keeffe: Art and Letters. National Gallery of Art.
Precaución: Estas citas no son 100% exactas.