Blum, Alexander S. and Rickles, Dean (2018). Chen-Ning Yang (1947): On Quantized Space-Time. In: Quantum Gravity in the First Half of the Twentieth Century: A Sourcebook. Berlin: Max-Planck-Gesellschaft zur Förderung der Wissenschaften.
Chen-Ning Yang (1947). On Quantized Space-Time. Physical Review, 72: 874.