Umi Kalthom Abdullah, et al. “Awareness of Halal Supply Chain Among Traders in Farmers’ Market Around Klang Valley Area, Malaysia”. Politeknik & Kolej Komuniti Journal of Social Sciences and Humanities, vol. 4, no. 1, Nov. 2019, pp. 134-4, https://app.mypolycc.edu.my/journal/PMJSSH/article/view/188.