Permanent link
https://openaccess.library.uitm.edu.my/Record/ndltd-UTEXAS-oai-repositories.lib.utexas.edu-2152-ETD-UT-2011-05-3234
https://openaccess.library.uitm.edu.my/Record/ndltd-UTEXAS-oai-repositories.lib.utexas.edu-2152-ETD-UT-2011-05-3234