Lehane, S. (1976). Help your baby learn: 100 Piaget-based activities for the first two years of life. Prentice-Hall.
Chicago-Zitierstil (17. Ausg.)Lehane, Stephen. Help Your Baby Learn: 100 Piaget-based Activities for the First Two Years of Life. Englewood Cliffs, NJ: Prentice-Hall, 1976.
MLA-Zitierstil (9. Ausg.)Lehane, Stephen. Help Your Baby Learn: 100 Piaget-based Activities for the First Two Years of Life. Prentice-Hall, 1976.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.