McCullough, D. (2017). The american spirit: Who we are and what we stand for.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMcCullough, David. The American Spirit: Who We Are and What We Stand for. 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMcCullough, David. The American Spirit: Who We Are and What We Stand for. 2017.
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