Ballentine, Leslie E (2014). Quantum Mechanics: A Modern Development (2nd ed.). World Scientific Publishing Company. doi:10.1142/9038. ISBN978-981-4578-60-8.
Hall, B. C. (2013). "Chapter 6: Perspectives on the Spectral Theorem". Quantum Theory for Mathematicians. Graduate Texts in Mathematics. Vol. 267. Springer. Bibcode:2013qtm..book.....H. ISBN978-1461471158.
nasa.gov
ntrs.nasa.gov
Heisenberg, W. (1927). Über den anschaulichen Inhalt der quantentheoretischen Kinematik und Mechanik, Z. Phys.43: 172–198. Translation as 'The actual content of quantum theoretical kinematics and mechanics'. Also translated as 'The physical content of quantum kinematics and mechanics' at pp. 62–84 by editors John Wheeler and Wojciech Zurek, in Quantum Theory and Measurement (1983), Princeton University Press, Princeton NJ.