Ross, C. S., & Slavin, B. (2014). Shapes in math, science and nature: Squares, triangles and circles. Kids Can Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRoss, Catherine Sheldrick, और Bill Slavin. Shapes in Math, Science and Nature: Squares, Triangles and Circles. Toronto: Kids Can Press, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRoss, Catherine Sheldrick, और Bill Slavin. Shapes in Math, Science and Nature: Squares, Triangles and Circles. Kids Can Press, 2014.
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