(1966). Mathematics in primary education: Learning of mathematics by young children. Unesco Inst. for Education.
Chicago-Zitierstil (17. Ausg.)Mathematics in Primary Education: Learning of Mathematics by Young Children. Hamburg: Unesco Inst. for Education, 1966.
MLA-Zitierstil (9. Ausg.)Mathematics in Primary Education: Learning of Mathematics by Young Children. Unesco Inst. for Education, 1966.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.