Steffens, B. (2019). Gun violence and mass shootings. ReferencePoint Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSteffens, Bradley. Gun Violence and Mass Shootings. San Diego, CA: ReferencePoint Press, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSteffens, Bradley. Gun Violence and Mass Shootings. ReferencePoint Press, 2019.
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