- Mathematical Thining in Kindergarten; Introduction; Grade Level K (Investigations in Number, Data, and Space TERC)
- How Many in All?; Counting and the Number System; Grade Level K (Investigations in Number, Data, and Space)
- Picturing Polygons: 2-d Geometry
- Collecting, Counting, And Measuring (Developing Number Sense, Kindergarten)
- Mathmatical Thinking at Grade 5
- Abby Klein
- Denise Fleming
- Marilyn Burns
- Pat Hutchins
- Marcia Brown
- Jim Aylesworth
- Pat Rodegast
- Pat Mora
- Lucy McCormick Calkins
- Cindy Neuschwander
- Eric Litwin
- Brod Bagert
- Helena Clare Pittman
- Dayle Ann Dodds
- UNICEF
- Blaise Cendrars
- June Crebbin
- Karen Economopoulos
- Leah Mermelstein
- Kliman Murray Economopoulos