Haynes, W. (1959). Brimstone: The stone that burns; the story of the Frasch sulphur industry. Van Nostrand.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHaynes, Williams. Brimstone: The Stone That Burns; the Story of the Frasch Sulphur Industry. Princeton, N. J: Van Nostrand, 1959.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHaynes, Williams. Brimstone: The Stone That Burns; the Story of the Frasch Sulphur Industry. Van Nostrand, 1959.
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