References

1. Pearson Assessment SupportWhat is Preschool Language Scale, Fourth Edition(PLS-)?

Article ID;2473 Last updated: 07 Apr,2010

2. Advancing Research, Improving Education Reading Resources Reading Assessment Database: Search Results copyright 2011 SEDL

2. University Center for the Development of Langauge and Literacy(UCLL) Clinical Services Testing InstrumentsUniversity of Michigan UCLL 2011