suggest reference book for quantum mechanics ,for PG LEVEL
The books depends on your interest. As , there are many books available for reference it depends on you which you want to read. Here are some books which you can refer :
Sakurai - MQM and AQM
Schwabl
- AQM
Weinberg
's books on QFT
For relativistic quantum mechanics:
Greiner
- RQM
M. E. Rose
- Relativistic Electron Theory.
For Path Integral theory, Dirac & Feynman 's original papers.
You can refer the ebooks also or can buy them.