Abdul Razak Omar, Mahyudin Omar, Ahmad Shaharudin Abdul Latif, Anim Zalina Azizan, and Muhammad Suhaimi Sulong. MODUL INSTRUMEN DIAGNOSTIK USAHAWAN BERJAYA. Penerbit UTHM, 2017. Accessed August 26, 2026. https://monograph.uthm.edu.my/index.php/penerbituthm/catalog/book/195.