DUNCAN, E. R. (1972). Modern school mathematics structure and use. Houghton Mifflin co.
Dyfyniad Arddull ChicagoDUNCAN, Ernest R. Modern School Mathematics Structure and Use. Boston: Houghton Mifflin co, 1972.
Dyfyniad MLADUNCAN, Ernest R. Modern School Mathematics Structure and Use. Houghton Mifflin co, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.