Hello,
Is there any good book on Continuous-Variable Approach and where can be find? Thanks
The best (and most up to date) resource is currently the Strawberry Fields website — check out the photonics section: Quantum Photonics — Strawberry Fields
In addition, the book Quantum Continuous Variables by Alessio Serafini is a good, albeit post-graduate level, text 
No worries @Ljubomir_Budinski!