O'Brien, K. (2018). Fly girls: How five daring women defied all odds and made aviation history. Houghton Mifflin Harcourt.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रO'Brien, Keith. Fly Girls: How Five Daring Women Defied All Odds and Made Aviation History. Boston: Houghton Mifflin Harcourt, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रO'Brien, Keith. Fly Girls: How Five Daring Women Defied All Odds and Made Aviation History. Houghton Mifflin Harcourt, 2018.
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