A pedido do editor, publica-se o seguinte esclarecimento:
We would like to add the following: The author, Godfrey Mwakikagile, cited the source he had available and identified it the way it was. It did not have the name of Joao Manuel Cabrita. Therefore it is not a case of non-attribution by Godfrey Mwakikagile but one of insufficient citation. Had the pdf file been identified by the name of the author, Godfrey Mwakikagile would have named the author of that pdf file in his book. That is why we are going to include the name of Joao Manuel Cabrita in the next edition in the text and in the chapter notes.
New Africa Press