APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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