Bulletin of Friends' Historical Society of Philadelphia. Friends Historical Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBulletin of Friends' Historical Society of Philadelphia. Friends Historical Association.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBulletin of Friends' Historical Society of Philadelphia. Friends Historical Association.
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