Per-unit systems with special reference to electrical machines /
M. R. Harris, P. J. Lawrenson and J. M. Stephenson.
- Cambridge : University Press, c1970.
- xii,116p. : ill. ; 22 cm.
- IEE monograph series, 4 .
- Institution of Electrical Engineers, London. I.E.E. monograph series, 4 .