Haacke, Wilfrid H. G. (2018), Kamusella, Tomasz; Ndhlovu, Finex (eds.), "Khoekhoegowab (Nama/Damara)", The Social and Political History of Southern Africa's Languages, Palgrave Macmillan UK, pp. 133–158, doi:10.1057/978-1-137-01593-8_9, ISBN978-1-137-01592-1