Cowley,Robert, Carr,Caleb, Lukas, J., & Keegen,John. (2001). The collected What if?: Eminent historians imagining what might have been. Putnam.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCowley,Robert, Carr,Caleb, John Lukas, और Keegen,John. The Collected What If?: Eminent Historians Imagining What Might Have Been. Putnam, 2001.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCowley,Robert, et al. The Collected What If?: Eminent Historians Imagining What Might Have Been. Putnam, 2001.
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