APA (7th ed.) Citation

Posamentier, A. S., & Salkind, C. T. (1996). Challenging problems in geometry ([slightly altered republication].). Dover Publ.

Chicago Style (17th ed.) Citation

Posamentier, Alfred S., and Charles T. Salkind. Challenging Problems in Geometry. [slightly altered republication]. New York: Dover Publ, 1996.

MLA (9th ed.) Citation

Posamentier, Alfred S., and Charles T. Salkind. Challenging Problems in Geometry. [slightly altered republication]. Dover Publ, 1996.