Boothroyd, J. (2010). Give it a push! give it a pull!: A look at forces.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBoothroyd, Jennifer. Give It a Push! Give It a Pull!: A Look at Forces. 2010.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBoothroyd, Jennifer. Give It a Push! Give It a Pull!: A Look at Forces. 2010.
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