Rob, Peter
Wadsworth, 1993
Buku Teks
Kroenke, David M., 1946-
Science Research Association, 1983
Buku Teks
Kroenke, David M., 1946-
Science Research Association, 1983
Buku Teks
Kroenke, David M., 1946-
Prentice Hall,, 1998
Buku Teks
Connolly, Thomas M.
Addison-Wesley , 2005
Buku Teks