Blythe, Jim, author
Prentice-Hall, 2000
Buku Teks
Eagle, Lynne, author
Taylor & Francis Group, 2015
Buku Teks
Egan, John, 1952-, author
Sage Publications, 2015
Buku Teks
Nickels, William G.
Grid, INC , 1976
Buku Teks
Lwin, May, author
Bhuana Ilmu Populer, 2005
Buku Teks