Institut National de la Statistique–RD Congo (2019). Annuaire Statistique RDC 2017(PDF) (in French). p. 36 Tableau 1.2. Archived(PDF) from the original on 14 June 2020. Retrieved 22 August 2020.
Institut National de la Statistique–RD Congo (2019). Annuaire Statistique RDC 2017(PDF) (in French). p. 36 Tableau 1.2. Archived(PDF) from the original on 14 June 2020. Retrieved 22 August 2020.