Dr. Rehab Abdelsalam Elsanousi, Dr. Mahdi Hamad Elballa Hamad, and Abdelrahman Mohammedain Abdelrahman Ahmed. 2021. “Investigating of ESP Vocabulary Difficulties Encountered by EFL Learners”. White Nile Journal for Studies and Research, no. 18 (September):103-22. https://journals.wnu.edu.sd/index.php/wnjsr/article/view/110.