Dear Vaibhav,
A book on SAPUI5 is expected to release on August 8th, 2014 (Tentative). So, I hope this will be helpful to you.
https://www.sap-press.com/getting-started-with-sapui5_3565/
In the mean time you can refer to UI5 demo kit as suggested by other folks.
Regards,
Sai Vellanki.