Barker, M. R. (1890). The story of Don Bosco and his work. London.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBarker, Mrs. Raymond. The Story of Don Bosco and His Work. London, 1890.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBarker, Mrs. Raymond. The Story of Don Bosco and His Work. London, 1890.
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