Electric transformers.

Electrical machines and transformers : principles and applications by: Karnas, Joseph A.; Ryff, Peter F.; Platnick, David (Language materials, printed)

Electric machinery and transformers by: Kosow, Irving L. (Language materials, printed)

The J & P transformer book : a practical technology of the power transformer by: Franklin, D. P.; Heathcote, Martin J. (Electronic resources)