Lipton, J. S. Preschool children's mapping of number words to nonsymbolic numerosities. 2005 p.978-988.
Chicago-viite (17. p.)Lipton, Jennifer S. Preschool Children's Mapping of Number Words to Nonsymbolic Numerosities. September/October: 2005 p.978-988.
MLA-viite (9. p.)Lipton, Jennifer S. Preschool Children's Mapping of Number Words to Nonsymbolic Numerosities. 2005 p.978-988.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.