APA (7th ed.) Citation

Lewis, J. L., & Heafford, P. E. (1969). Electric currents. Longman.

Chicago Style (17th ed.) Citation

Lewis, John L., and Philip E. Heafford. Electric Currents. London: Longman, 1969.

MLA (9th ed.) Citation

Lewis, John L., and Philip E. Heafford. Electric Currents. Longman, 1969.

Warning: These citations may not always be 100% accurate.