Kingdon, Donald Ralph
Tavistock , 1973
Buku Teks
Cummings, Thomas G., 1944-, author
CT Cengage Learning, 2015
Buku Teks
Hesseling, P. G. M.
Pergamon Press, 1982
Buku Teks
Bridges, William
New York, 1991
Buku Teks
Miles, Robert H.
Goodyear Publishing Company, 1980
Buku Teks