Christie, A. (2022). At Bertram's Hotel (First William Morrow paperback edition.). William Morrow.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChristie, Agatha. At Bertram's Hotel. First William Morrow paperback edition. New York: William Morrow, 2022.
एमएलए (8वां संस्करण) प्रशस्ति पत्रChristie, Agatha. At Bertram's Hotel. First William Morrow paperback edition. William Morrow, 2022.
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