Francis, Thomas George, author
ELBS, 1992
Buku Teks
Francis, Thomas George, author
Longman, 1971
Buku Teks
Robertson, Christoper R.
London: Edward Arnold, 1993
Buku Teks
edited by the Electricity Training Association
The Institution of Electrical Engineers, 1995
Buku Teks
edited by the Electricity Training Association
The Institution of Electrical Engineers, 1997
Buku Teks