Muhammad Muhayyidin, A. H.; Ghazali, N. A.; Abu Bakar, N. F.; Ibrahim, W. A.; Sauki, A.; Hassan, Z. Tannin Extraction from Bark of Rhizophora Mucronata Using Soxhlet and Boiling Techniques. Int. J. Adv. Sci. Eng. Inf. Technol. 2018, 8, 2525-2530.