Dyfyniad APA
Salkind, C. T., & Earl, J. M. (1973). The contest problem book. Mathematical Association of America.
Dyfyniad Arddull Chicago
Salkind, Charles T., and James M. Earl. The Contest Problem Book. Washington, D.C.: Mathematical Association of America, 1973.
Dyfyniad MLA
Salkind, Charles T., and James M. Earl. The Contest Problem Book. Mathematical Association of America, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.