LIB-1691.2018 Edwin A. Abbott; Ian Stewart (introduction & notes). The Annotated Flatland: A Romance of Many Dimensions. — Oxford (UK): The Perseus Press, 2002.
TSU-0439.2025 Ōnin suemon-zōgan tsuba with kamon and botanical motifs / Early Edo Period, 17th century.
LIB-2662.2021 A Square [Edwin A. Abbott]. Flatland: A romance of many dimensions / New and revised edition. — London: Seeley and Co., 1884.
