Kassim, A.H. and Theng, T.C. 2009. Kefahaman dan Aplikasi Konsep Asid-Bes dalam Kehidupan Harian dalam Kalangan Pelajar Tingkatan Empat Sains Johor Bahru: Understanding and Application of Acid-Base Concepts in The Daily Lives of Form Four Students in Johor Bahru. Journal of Science and Mathematics Letters. 1, 1 (Jun. 2009), 22–29.