APA (7th ed.) Citation

Langsdorf, A. S. (1915). Principles of direct current machines. McGraw-Hill Book Co..

Chicago Style (17th ed.) Citation

Langsdorf, Alexander Suss. Principles of Direct Current Machines. New York: McGraw-Hill Book Co., 1915.

MLA (9th ed.) Citation

Langsdorf, Alexander Suss. Principles of Direct Current Machines. McGraw-Hill Book Co., 1915.