Ula, M., Abd. Hamid, S. Z., Abd. Rahman, F., Hashim, A. W. I., Baharom, A., & Ahmad, A. H. (2007). Numerical modelling of sound intensity based on sound absorption coeficient of WCPP at 40% perforation ratio. Penerbit UTM.

Ula, Munirul, Siti Zaleha Abd. Hamid, Fareha Abd. Rahman, Abdul Wahab Ishari Hashim, Amerudin Baharom, and Abdul Hamid Ahmad. Numerical Modelling of Sound Intensity Based On Sound Absorption Coeficient of WCPP At 40% Perforation Ratio. Penerbit UTM, 2007.

Ula, Munirul, et al. Numerical Modelling of Sound Intensity Based On Sound Absorption Coeficient of WCPP At 40% Perforation Ratio. Penerbit UTM, 2007.