Grenfell, D. The Angolan papers of David Grenfell. University of York, Photographic Dept..
Lua i Stíl Chicago (17ú heag.)Grenfell, David. The Angolan Papers of David Grenfell. [York, England]: University of York, Photographic Dept..
Lua MLA (8ú heag.)Grenfell, David. The Angolan Papers of David Grenfell. University of York, Photographic Dept..
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