Gemignani, Michael C., author
CBI Publishing , 1981
Buku Teks
Vandenburgh III, Edward C.
The Bobbs-Merill Company,Inc., 1968
Buku Teks
Davies, Jack, author
West Publishing, 1975
Buku Teks
Wood, William
Percival Marshall, 1949
Buku Teks
Gould, William B., IV, author
MIT Press, 1982
Buku Teks