Boothroyd, J., & Intuitive. (2017). What holds us to earth?: A look at gravity.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBoothroyd, Jennifer, और Intuitive. What Holds Us to Earth?: A Look at Gravity. 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBoothroyd, Jennifer, और Intuitive. What Holds Us to Earth?: A Look at Gravity. 2017.
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