APA Citation

Einstein, A., & Minkowski, H. (1920). The principle of relativity. Kolkata: University of Calcutta.

Chicago Style Citation

Einstein, A., and H. Minkowski. The Principle of Relativity. Kolkata: University of Calcutta, 1920.

MLA Citation

Einstein, A., and H. Minkowski. The Principle of Relativity. Kolkata: University of Calcutta, 1920.

Warning: These citations may not always be 100% accurate.