Esper, M. T. (2022). A sacred oath: Memoirs of a secretary of defense during extraordinary times.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEsper, Mark T. A Sacred Oath: Memoirs of a Secretary of Defense During Extraordinary Times. 2022.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEsper, Mark T. A Sacred Oath: Memoirs of a Secretary of Defense During Extraordinary Times. 2022.
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