Strecker, David E., author
CRC Press Taylor & Francis Group, 2011
Buku Teks
Jackson, Grdon E., author
Prentice-Hall, 1993
Buku Referensi
Hanslove, Kurt L.
Cornell University , 1967
Buku Teks
Metz, Harold W.
The Brookings Institution, 1945
Buku Teks
Gould, William B., IV, author
MIT Press, 1982
Buku Teks