Twombly, C., & Schmidt, K. Cy Twombly. Menil Collection; Houston Fine Art Press.
Chicago Style (17. basım) AtıfTwombly, Cy, ve Katharina Schmidt. Cy Twombly. Houston, Tex: Menil Collection; Houston Fine Art Press.
MLA (8th ed.) AtıfTwombly, Cy, ve Katharina Schmidt. Cy Twombly. Menil Collection; Houston Fine Art Press.
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