Hassan, Norhasliza, and Hawwa Abdul Mokti. “Extending the Theory of Planned Behaviour: Spiritual Values and Social Norms As Drivers of Sustainable Behaviour Among University Students in Malaysia”. Journal of Islamic, Social, Economics and Development, vol. 10, no. 79, Dec. 2025, pp. 475-83, https://academicinspired.com/jised/article/view/3845.