Kirk, A. (2000). A Flier in Oil Adolph B. Spreckels and the Rise of the California Petroleum Industry. Historical Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKirk, Anthony. A Flier in Oil Adolph B. Spreckels and the Rise of the California Petroleum Industry. Historical Society, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKirk, Anthony. A Flier in Oil Adolph B. Spreckels and the Rise of the California Petroleum Industry. Historical Society, 2000.
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