Sajap, Sarah, Noor Azly Mohammed Ali, and Huajin Zhang. 2022. “Understanding Behaviour and Preference: A Study on Designing Litter Prevention Outdoor Signage”. KUPAS SENI: Jurnal Seni Dan Pendidikan Seni 10 (1):50-58. https://doi.org/10.37134/kupasseni.vol10.1.6.2022.