Spencer, S. (2017). The hidden: A Monika Paniatowski mystery (First world edition.). Severn House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpencer, Sally. The Hidden: A Monika Paniatowski Mystery. First world edition. Sutton, Surrey, England: Severn House, 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSpencer, Sally. The Hidden: A Monika Paniatowski Mystery. First world edition. Severn House, 2017.
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