(1980). Hercules Mining Company, Day Mines Group, personnel records: Names extracted from employment cards 1918-1927. s.n..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHercules Mining Company, Day Mines Group, Personnel Records: Names Extracted from Employment Cards 1918-1927. [S.l..: s.n., 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHercules Mining Company, Day Mines Group, Personnel Records: Names Extracted from Employment Cards 1918-1927. s.n., 1980.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.