Cita APA (7a ed.)

Langsdorf, A. S. (1959). Principles of Direc-current Machines (6 a ed.). McGraw-Hill.

Cita Chicago Style (17a ed.)

Langsdorf, Alexander S. Principles of Direc-current Machines. 6 a ed. [s. l.]: McGraw-Hill, 1959.

Cita MLA (8a ed.)

Langsdorf, Alexander S. Principles of Direc-current Machines. 6 a ed. McGraw-Hill, 1959.