Barker, M. R. (1890). The story of Don Bosco and his work. London.
Chicago-referens (17:e uppl.)Barker, Mrs. Raymond. The Story of Don Bosco and His Work. London, 1890.
MLA-referens (8:e uppl.)Barker, Mrs. Raymond. The Story of Don Bosco and His Work. London, 1890.
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