Akmal, S., M. Fauadi, R. Hambali, N. Hadzlin, and R. Taufik. “A CONCEPTUAL DESIGN OF SECONDARY PADDING OF CHILD HELMET USING SWIMMING TUBE”. Journal of Advanced Manufacturing Technology (JAMT), Vol. 12, no. 1(4), 1, pp. 1-14, https://jamt.utem.edu.my/jamt/article/view/4892.