Mohammed, Sarkhel Shawkat, y Osman Shahin. «Service Quality Perspectives in Telecommunication Sector: Trust and Loyalty Investigation». Amazonia Investiga 9, no. 28 (abril 21, 2020): 394–403. Accedido diciembre 12, 2025. https://amazoniainvestiga.info/index.php/amazonia/article/view/1334.