Boyle, W. (2019). A friend is a gift you give yourself: A novel (First Pegasus Books hardcover edition.). Pegasus Crime.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBoyle, William. A Friend Is a Gift You Give Yourself: A Novel. First Pegasus Books hardcover edition. New York: Pegasus Crime, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBoyle, William. A Friend Is a Gift You Give Yourself: A Novel. First Pegasus Books hardcover edition. Pegasus Crime, 2019.
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