Etiubon, R. U. (2012). Problem-based Learning Approach for Teaching electrovalent, covalent and coordinate covalent combinations in Senior Secondary Chemistry. In G. O. Ojokuku; E. O. Amadi; Hadiza, I. Yero & Pep M. Ibole (Eds.). STAN Chemistry Panel Series 8: Strategies for teaching particulate nature of matter and chemical combinations: A Handbook for Chemistry Teachers (pp. 67-70). MacChin Multimedia Designers, Zaria.

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