@article{effiong2015,
  title={Impact of Instructional Materials in Teaching and Learning of Biology in Senior Secondary Schools in Yakurr LG A},
  author={Oji Ekpo Effiong and Charles E. Igiri},
  year={2015},
  journal={International Letters of Social and Humanistic Sciences},
  doi={10.18052/www.scipress.com/ilshs.62.27},
  url={https://doi.org/10.18052/www.scipress.com/ilshs.62.27}
}