Barker, M. R. (1890). The story of Don Bosco and his work. London.
Lua i Stíl Chicago (17ú heag.)Barker, Mrs. Raymond. The Story of Don Bosco and His Work. London, 1890.
Lua MLA (8ú heag.)Barker, Mrs. Raymond. The Story of Don Bosco and His Work. London, 1890.
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