Gottesfeld, J., & Tavares, M. (2021). Twenty-one steps: Guarding the Tomb of the Unknown Soldier (First edition.). Candlewick Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGottesfeld, Jeff, और Matt Tavares. Twenty-one Steps: Guarding the Tomb of the Unknown Soldier. First edition. Somerville, Massachusetts: Candlewick Press, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGottesfeld, Jeff, और Matt Tavares. Twenty-one Steps: Guarding the Tomb of the Unknown Soldier. First edition. Candlewick Press, 2021.
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