Suki, Norazah Mohammed, and Norbayah Mohammed Suki. “Impact of Consumption Values on Consumer Environmental Concern Regarding Green Products: Comparing Light, Average, and Heavy Users’”. International Journal of Economics and Financial Issues, vol. 5, no. 1S, July 2015, pp. 82-97, https://econjournals.com./index.php/ijefi/article/view/1348.