Biblioteca Nacional de Portugal

"Perigo e fascínio em África Angola 1962 - 1964"/Berto Estrela
https://www.google.pt/url?sa=t&rct=j&q=&esrc=s&source=web&cd=22&cad=rja&ved=0CDgQFjABOBQ&url=http%3A%2F%2Fcatalogo.bnportugal.pt%2Fipac20%2Fipac.jsp%3Fsession%3D1322233IE0F57.907211%26profile%3Dbn%26uri%3Dlink%3D3100018~!1424827~!3100024~!3100022%26aspect%3Dbasic_search%26menu%3Dsearch%26ri%3D1%26source%3D~!bnp%26term%3DEstrela%252C%2BBerto%26index%3DAUTHOR&ei=GWw1Ua3mA8GjPd6igYAN&usg=AFQjCNFmOMY9N6Msa1Y1TuQNnWJM13SuJA&sig2=NzJOODZgtEZI7VrRg9aTew

Universidade de Stanford - Califórnia (USA)

Divulgação da obra "Perigo e fascínio em África Angola 1962 - 1964"https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CDAQFjAA&url=http%3A%2F%2Fsearchworks.stanford.edu%2Fview%2F9580074&ei=mmo1UcCgLMi2PY2ogbAF&usg=AFQjCNHtt_loZ5zx-anyJR2yHn3IH-X7Ag&sig2=bVtxE0kAeLwmNP_cbJOB2Q&bvm=bv.43148975,d.ZWUhttp://www.searchworks.stanford.edu/view/9580074