Akwaji, Patrick Ishoro, et al. “Parkia Biglobosa Jacq (dawa-dawa): The Threatened Giant of the Guinea Savanna of Nigeria (The Cross River State Situation)”. Global Journal of Science Frontier Research, vol. 16, no. C2, May 2016, pp. 21-32, https://journalofscience.org/index.php/GJSFR/article/view/1774.