Theraja, B. L. (1994). A text-book of electrical technology in S.I. system of units (including rationalized M.K.S.A. System): Vol.I, basic electrical engineering (Twenty-first edition.). Nirja Construction & Development.

Theraja, B. L. A Text-book of Electrical Technology in S.I. System of Units (including Rationalized M.K.S.A. System): Vol.I, Basic Electrical Engineering. Twenty-first edition. Ram Nagar, New Delhi: Nirja Construction & Development, 1994.

Theraja, B. L. A Text-book of Electrical Technology in S.I. System of Units (including Rationalized M.K.S.A. System): Vol.I, Basic Electrical Engineering. Twenty-first edition. Nirja Construction & Development, 1994.