Ward , r. P. . .. (1969). Introduction to electrical engineering (3rd ed.). Prentice Hall.
Cita Chicago (17th ed.)Ward , robert P. Introduction to Electrical Engineering. 3rd ed. New Delhi: Prentice Hall, 1969.
Cita MLA (9th ed.)Ward , robert P. Introduction to Electrical Engineering. 3rd ed. Prentice Hall, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.