Stone, Geoffrey R.
Little, Brown and Company, 1991
Buku Teks
Wade, E. C. S. (Emlyn Capel Stewart), author
Longmans Green, 1951
Buku Teks
Wade, E. C. S. (Emlyn Capel Stewart), author
[publisher not identified], [date of publication not identified]
Buku Teks
Nowak, John E., author
Thomson/West, 2010
Buku Teks
Greinert, Wolf-Dietrich
Eschborn : Deutsche Gesellschaft fur Technische Zusammenarbeit (GTS), 1992.
Buku Teks