| 1 | Principles of Quantum Mechanics, P. A. M. Dirac, Oxford University. Press (1930) |
| 2 | Modern Quantum Mechanics, J.J. Sakurai, J. Napolitano, Cambridge University Press; 2nd edition (2017) |
| 3 | Principles of Quantum Mechanics, H. C. Ohanian, Prentice Hall (1990) |
| 4 | Principles of Quantum Mechanics, R. Shankar 2. Edition, Plenum Press (1994) |