Cita APA (7a ed.)

Langsdorf, A. S. (1959). Priciples of direct-current machines. McGraw-Hill.

Cita Chicago Style (17a ed.)

Langsdorf, Alexander S. Priciples of Direct-current Machines. New York: McGraw-Hill, 1959.

Cita MLA (8a ed.)

Langsdorf, Alexander S. Priciples of Direct-current Machines. McGraw-Hill, 1959.