Hussin, Siti Farah, Gauri Birasamy, and Zunainah Hamid. 2016. “Design of Butterworth Band-Pass Filter”. Politeknik & Kolej Komuniti Journal of Engineering and Technology 1 (1). Putrajaya, Malaysia:32-46. https://app.mypolycc.edu.my/journal/index.php/PMJET/article/view/585.