مقالة · مجلة · 2016
Harry Barton Essel, Patrick Osei-Poku, Akosua Tachie-Menson, Nana Afia Opoku-Asare
the Journal of Education and Practice, http://files. eric. ed. gov/fulltext/EJ1099557. pdf (diakses 25 September 2017)
كما طُبع: HB Essel
كما طُبع: P Osei-Poku
كما طُبع: A Tachie-Menson
كما طُبع: NA Opoku-Asare