Croft, H. (1991). Unsolved probelsm in Geometry. Springer - verlag.
Chicago Edition CitationCroft, H.T. Unsolved Probelsm in Geometry. Springer - verlag, 1991.
MLA Edition CitationCroft, H.T. Unsolved Probelsm in Geometry. Springer - verlag, 1991.
Warning: These citations may not always be 100% accurate.