Cita APA (7a ed.)

Harnwell, G. P. 1. (1949). Principles of electrecity and electromagnetism. McGraw-Hill Book Co..

Cita Chicago Style (17a ed.)

Harnwell, Gaylord Probasco 1903. Principles of Electrecity and Electromagnetism. New York: McGraw-Hill Book Co., 1949.

Cita MLA (8a ed.)

Harnwell, Gaylord Probasco 1903. Principles of Electrecity and Electromagnetism. McGraw-Hill Book Co., 1949.