Nnoli, Juliana Nkiru, and Felicity Uju Onwudinjo. “Identifying the Process Skills Involved in Teaching Chemistry through the Extraction of Oil from Castor Oil Seed”. Journal of Chemistry Studies 3, no. 1 (December 30, 2023): 01–06. Accessed September 7, 2025. https://al-kindipublishers.org/index.php/jcs/article/view/6545.