رابط دائم
https://update.library.uitm.edu.my./Record/Ng%20K.M.;%20Johari%20J.;%20Abdullah%20S.A.C.;%20Ahmad%20A.;%20Laja%20B.N.
https://update.library.uitm.edu.my./Record/Ng%20K.M.;%20Johari%20J.;%20Abdullah%20S.A.C.;%20Ahmad%20A.;%20Laja%20B.N.