Cita APA (7th ed.)

Langsrorf, . A. S. (1959). Principal of direct current machines (6th ed.). Mc Graw Hill.

Cita Chicago (17th ed.)

Langsrorf, Alexander S. Principal of Direct Current Machines. 6th ed. New York: Mc Graw Hill, 1959.

Cita MLA (9th ed.)

Langsrorf, Alexander S. Principal of Direct Current Machines. 6th ed. Mc Graw Hill, 1959.