APA (7th ed.) Citation

Abbott, E. A. (1998). Flatland: A romance of many dimensions. Penguin Books.

Chicago Style (17th ed.) Citation

Abbott, Edwin Abbott. Flatland: A Romance of Many Dimensions. New York: Penguin Books, 1998.

MLA (9th ed.) Citation

Abbott, Edwin Abbott. Flatland: A Romance of Many Dimensions. Penguin Books, 1998.