Crowhurst, N. H. (1965). Graphical calculators and their design. Hayden Book.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCrowhurst, Norman H. Graphical Calculators and Their Design. New York: Hayden Book, 1965.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCrowhurst, Norman H. Graphical Calculators and Their Design. Hayden Book, 1965.
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