CHAN, CHEEMING, WENJING CHONG, and Rumaizatul Adawiah Mukhtar. 2020. “ Pile Dynamic Analyzer (PDA) Test: An Overview of the Pile Integrity Evaluation Technique”. Progress in Engineering Application and Technology 1 (1): 48-54. https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/81.