Salim, R., Syed Tarmizi Syed Shazali, S. Hamdan, M. Andrew-Munot, and A. M. A. A. M. Mohtar. 2018. “A Review on Ruben’s Tube As Acoustic Propagator”. International Journal of Automotive and Mechanical Engineering 15 (4):6025-33. https://doi.org/10.15282/ijame.15.4.2018.22.0459.