Hancock, John C.
McGraw-Hill, 1961
Buku Teks
Devito, Joseph A.
Prentice-Hall, 1971
Buku Teks SO
Shannon, Claude E.
University of Illinois Press, 1964
Buku Teks
Shannon, Claude E.
University of Illinois Press, 1972
Buku Teks
West, Richard L.
McGraw-HIll, 2007
Buku Teks SO