Becker, H., & Attoe, S. (2009). What's the big idea?: Inventions that changed life on earth forever. Maple Leaf Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBecker, Helaine, और Steve Attoe. What's the Big Idea?: Inventions That Changed Life on Earth Forever. Toronto, Ont.: Maple Leaf Press, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBecker, Helaine, और Steve Attoe. What's the Big Idea?: Inventions That Changed Life on Earth Forever. Maple Leaf Press, 2009.
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