Gannon, N. (2017). The Doldrums and the Helmsley curse (First edition.). Greenwillow Books, an imprint of HarperCollinsPublishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGannon, Nicholas. The Doldrums and the Helmsley Curse. First edition. New York, NY: Greenwillow Books, an imprint of HarperCollinsPublishers, 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGannon, Nicholas. The Doldrums and the Helmsley Curse. First edition. Greenwillow Books, an imprint of HarperCollinsPublishers, 2017.
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