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: Apr. 09, 2026. [Online]. Available: https://penerbit.uthm.edu.my/omp/index.php/penerbituthm/catalog/book/195