Apple. The Family Legacy of Henry Clay. The University Press of Kentucky.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रApple. The Family Legacy of Henry Clay. The University Press of Kentucky.
एमएलए (9वां संस्करण) प्रशस्ति पत्रApple. The Family Legacy of Henry Clay. The University Press of Kentucky.
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