Mohammed, Sarkhel Shawkat, and Osman Shahin. “Service Quality Perspectives in Telecommunication Sector: Trust and Loyalty Investigation”. Amazonia Investiga 9, no. 28 (April 21, 2020): 394–403. Accessed October 8, 2025. https://www.amazoniainvestiga.info/index.php/amazonia/article/view/1334.