McClafferty, C. K. (2013). Fourth down and inches: Concussions and football's make-or-break moment. Carolrhoda Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMcClafferty, Carla Killough. Fourth Down and Inches: Concussions and Football's Make-or-break Moment. Minneapolis, MN: Carolrhoda Books, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMcClafferty, Carla Killough. Fourth Down and Inches: Concussions and Football's Make-or-break Moment. Carolrhoda Books, 2013.
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