Ward , r. P. . .. (1969). Introduction to electrical engineering (3rd ed.). Prentice Hall.
Chicago-viite (17. p.)Ward , robert P. Introduction to Electrical Engineering. 3rd ed. New Delhi: Prentice Hall, 1969.
MLA-viite (9. p.)Ward , robert P. Introduction to Electrical Engineering. 3rd ed. Prentice Hall, 1969.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.