Ngoffia Raphael Idoo Ajani Clement Kehi, Matthew Sunday Abolarin, Olugboji Oluwafemi Ayodeji , Jiya Jona , trans. 2015. “Design Fabrication and Testing Of a Motorized Paper Perforation Machine”. International Journal of Scientific Research and Management (IJSRM) 3 (4). https://ijsrm.net/index.php/ijsrm/article/view/651.