A. H. Muhammad Muhayyidin, N. A. Ghazali, N. F. Abu Bakar, W. A. Ibrahim, A. Sauki, and Z. Hassan, “Tannin Extraction from Bark of Rhizophora Mucronata Using Soxhlet and Boiling Techniques”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 8, no. 6, pp. 2525–2530, Dec. 2018.