Isaacs, N. (1966). New light on children's ideas of number: The work of Professor Piaget (6. impr.). Ward Lock Educational Co.
Chicago-Zitierstil (17. Ausg.)Isaacs, Nathan. New Light on Children's Ideas of Number: The Work of Professor Piaget. 6. impr. London, [Eng.]: Ward Lock Educational Co, 1966.
MLA-Zitierstil (9. Ausg.)Isaacs, Nathan. New Light on Children's Ideas of Number: The Work of Professor Piaget. 6. impr. Ward Lock Educational Co, 1966.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.