APA (7th ed.) Citation

Ray, W. O. (1934). An investigation of the theory of commutation. [publisher not identified].

Chicago Style (17th ed.) Citation

Ray, William Oliver. An Investigation of the Theory of Commutation. [College Station, Texas]: [publisher not identified], 1934.

MLA (9th ed.) Citation

Ray, William Oliver. An Investigation of the Theory of Commutation. [publisher not identified], 1934.