Gerdener, G. B. A. (1958). Recent developments in the South African mission field. Marshall, Morgan & Scott.
Lua i Stíl Chicago (17ú heag.)Gerdener, Gustav Bernhard August. Recent Developments in the South African Mission Field. London: Marshall, Morgan & Scott, 1958.
Lua MLA (9ú heag.)Gerdener, Gustav Bernhard August. Recent Developments in the South African Mission Field. Marshall, Morgan & Scott, 1958.
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