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https://update.library.uitm.edu.my./Record/Yusop%20M.F.M.;%20Yahaya%20N.K.E.M.;%20Karim%20J.;%20Yusoff%20M.A.M.;%20Idris%20I.;%20Abdullah%20A.Z.;%20Ahmad%20M.A.
https://update.library.uitm.edu.my./Record/Yusop%20M.F.M.;%20Yahaya%20N.K.E.M.;%20Karim%20J.;%20Yusoff%20M.A.M.;%20Idris%20I.;%20Abdullah%20A.Z.;%20Ahmad%20M.A.