Dyfyniad APA

Posamentier, A. S., & Salkind, C. T. (1996). Challenging problems in geometry. Dover Publications.

Dyfyniad Arddull Chicago

Posamentier, Alfred S., and Charles T. Salkind. Challenging Problems in Geometry. New York: Dover Publications, 1996.

Dyfyniad MLA

Posamentier, Alfred S., and Charles T. Salkind. Challenging Problems in Geometry. Dover Publications, 1996.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.