HARNWELL, G. P., & Gaylord P. HARNWELL. (1949). Principles of electricity and electromagnetism. 2nd ed. McGraw-Hill.
Chicago-viite (17. p.)HARNWELL, Gaylord P., ja Gaylord P. HARNWELL. Principles of Electricity and Electromagnetism. 2nd Ed. New York: McGraw-Hill, 1949.
MLA-viite (9. p.)HARNWELL, Gaylord P., ja Gaylord P. HARNWELL. Principles of Electricity and Electromagnetism. 2nd Ed. McGraw-Hill, 1949.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.