Hopkinson, D., & Ransome, J. (2006). Sky boys: How they built the Empire State Building. Schwartz & Wade Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHopkinson, Deborah, और James Ransome. Sky Boys: How They Built the Empire State Building. New York: Schwartz & Wade Books, 2006.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHopkinson, Deborah, और James Ransome. Sky Boys: How They Built the Empire State Building. Schwartz & Wade Books, 2006.
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