Abdul Jabbar , H., S. N. D. Shafai, and M. I. Ab Kadir. “Eco – Colourants and Collage: Exploring Natural Colours Extracted from Ketapang Leaves”. Environment-Behaviour Proceedings Journal, vol. 7, no. SI9, Oct. 2022, pp. 389-94, doi:10.21834/ebpj.v7iSI9.3947.