Twum, F., W. K. Mprah, A. K. Edusei, J. Ampratwum, and I. A. Gyamfi. “Competencies of Students With Visual Impairment in Using the White Cane in Their Learning Environment: A Case Study at Wenchi Senior High in Ghana”. Disability, CBR & Inclusive Development, vol. 29, no. 1, July 2018, pp. 78-92, doi:10.5463/dcid.v29i1.611.