Crouch, R., & Baldwin, G. (1964). Mathematics for elementary teachers. Wiley.
Dyfyniad Arddull ChicagoCrouch, Ralph, and George Baldwin. Mathematics for Elementary Teachers. New York: Wiley, 1964.
Dyfyniad MLACrouch, Ralph, and George Baldwin. Mathematics for Elementary Teachers. Wiley, 1964.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.