Cita APA (7th ed.)

HARNWELL, G. P., & Gaylord P. HARNWELL. (1949). Principles of electricity and electromagnetism. 2nd ed. McGraw-Hill.

Cita Chicago (17th ed.)

HARNWELL, Gaylord P., i Gaylord P. HARNWELL. Principles of Electricity and Electromagnetism. 2nd Ed. New York: McGraw-Hill, 1949.

Cita MLA (9th ed.)

HARNWELL, Gaylord P., i Gaylord P. HARNWELL. Principles of Electricity and Electromagnetism. 2nd Ed. McGraw-Hill, 1949.