- American Speech-Language-Hearing Association. Typical Speech and Language Development.
- First Signs
- Stanley Greenspan
- The Interdisciplinary Council on Developmental and Learning Disorders
- The Autism Education Network
- Autism Society
- The Gray Center for Social Learning and Understanding
- Apraxia-Kids
- Chicago Floortime Families
- Autism Community Connection for Illinois families
- Gigi's Playhouse. Down Syndrome Awareness Centers
- Come Unity
- Kids Health
- Child Development Institute
- American Speech-Language-Hearing Association. Child Speech and Language.