Siti Zarina Mohd Muji, Mohamad Hairol Jabbar, & Norfaiza Fuad. (2016). ELECTRICAL & ELECTRONIC ENGINEERING: THEORY AND APPLICATIONS SERIES 3: ULTRASONIC AND APPLICATION. Penerbit UTHM. https://publisher.uthm.edu.my/omp/index.php/penerbituthm/catalog/book/199