APA (7th ed.) Citation

Croft, H. T. (1991). Unsolved Problems in Geometry: Unsolved Problems in Intuitive Mathematics. Springer New York. https://doi.org/10.1007/978-1-4612-0963-8

Chicago Style (17th ed.) Citation

Croft, Hallard T. Unsolved Problems in Geometry: Unsolved Problems in Intuitive Mathematics. New York, NY: Springer New York, 1991. https://doi.org/10.1007/978-1-4612-0963-8.

MLA (9th ed.) Citation

Croft, Hallard T. Unsolved Problems in Geometry: Unsolved Problems in Intuitive Mathematics. Springer New York, 1991. https://doi.org/10.1007/978-1-4612-0963-8.