E. M. Purcell, . (1965). Electricity & Magnetism. New York: Mc Graw-Hill Pub.
E. M. Purcell, . 1965. Electricity & Magnetism. New York: Mc Graw-Hill Pub.
E. M. Purcell, . Electricity & Magnetism. New York: Mc Graw-Hill Pub. 1965.