Siti Zarina Mohd Muji, Zarina Tukiran. ELECTRICAL & ELECTRONIC ENGINEERING: THEORY AND APPLICATIONS SERIES 2: ULTRASONIC AND APPLICATION. Penerbit UTHM; 2015. Accessed August 17, 2024. https://publisher.uthm.edu.my/omp/index.php/penerbituthm/catalog/book/143