APA (7th ed.) Citation

Langsdorf, A. S. (1940). Principles of direct-current machines (5th ed.). McGraw-Hill book company, inc..

Chicago Style (17th ed.) Citation

Langsdorf, Alexander Suss. Principles of Direct-current Machines. 5th ed. New York and London: McGraw-Hill book company, inc., 1940.

MLA (8th ed.) Citation

Langsdorf, Alexander Suss. Principles of Direct-current Machines. 5th ed. McGraw-Hill book company, inc., 1940.