Douglas, C. (1980). Swans of other worlds: Kazimir Malevich and the origins of abstraction in Russia / by Charlotte Douglas. UMI Research Press.

Douglas, Charlotte. Swans of Other Worlds: Kazimir Malevich and the Origins of Abstraction in Russia / by Charlotte Douglas. Ann Arbor, Michigan: UMI Research Press, 1980.

Douglas, Charlotte. Swans of Other Worlds: Kazimir Malevich and the Origins of Abstraction in Russia / by Charlotte Douglas. UMI Research Press, 1980.