Hafstad, M. R. Guide to the mccormick collection of the state historical society of wisconsin. State Historical Society of Wisconsin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHafstad, Margaret R. Guide to the Mccormick Collection of the State Historical Society of Wisconsin. Madison: State Historical Society of Wisconsin.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHafstad, Margaret R. Guide to the Mccormick Collection of the State Historical Society of Wisconsin. State Historical Society of Wisconsin.
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