Carr, C. (2009). The Italian secretary: A further adventure of Sherlock Holmes (1st U.S. ed.). St. Martin's Griffin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCarr, Caleb. The Italian Secretary: A Further Adventure of Sherlock Holmes. 1st U.S. ed. New York: St. Martin's Griffin, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCarr, Caleb. The Italian Secretary: A Further Adventure of Sherlock Holmes. 1st U.S. ed. St. Martin's Griffin, 2009.
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