Groner, L. (2011). Ext JS 4 first look: A practical guide including examples of the new features in Ext JS 4 and tips to migrate from Ext JS 3. Packt Pub..

Groner, Loiane. Ext JS 4 First Look: A Practical Guide Including Examples of the New Features in Ext JS 4 and Tips to Migrate from Ext JS 3. Birmingham, U.K.: Packt Pub., 2011.

Groner, Loiane. Ext JS 4 First Look: A Practical Guide Including Examples of the New Features in Ext JS 4 and Tips to Migrate from Ext JS 3. Packt Pub., 2011.