Cita APA (7a ed.)

Croft, H. T., & Falconer, K. J. (1991). Unsolved problems in geometry. Springer-Verlag.

Cita Chicago Style (17a ed.)

Croft, Hallard T., y Kenneth J. Falconer. Unsolved Problems in Geometry. New York: Springer-Verlag, 1991.

Cita MLA (8a ed.)

Croft, Hallard T., y Kenneth J. Falconer. Unsolved Problems in Geometry. Springer-Verlag, 1991.