Diemer, A. K. (2022). Vigilance: The life of William Still, Father of the Underground Railroad (First edition.). Alfred A. Knopf.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDiemer, Andrew K. Vigilance: The Life of William Still, Father of the Underground Railroad. First edition. New York: Alfred A. Knopf, 2022.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDiemer, Andrew K. Vigilance: The Life of William Still, Father of the Underground Railroad. First edition. Alfred A. Knopf, 2022.
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