Armstrong. The Pleasure in Drawing. Fordham University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रArmstrong. The Pleasure in Drawing. Fordham University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रArmstrong. The Pleasure in Drawing. Fordham University Press.
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