Friddell, C., & Baddeley, E. (2021). Grace Banker and her Hello Girls answer the call: The heroic story of WWI telephone operators (First edition.). Calkins Creek, an imprint of Boyds Mills & Kane.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFriddell, Claudia, और Elizabeth Baddeley. Grace Banker and Her Hello Girls Answer the Call: The Heroic Story of WWI Telephone Operators. First edition. New York: Calkins Creek, an imprint of Boyds Mills & Kane, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFriddell, Claudia, और Elizabeth Baddeley. Grace Banker and Her Hello Girls Answer the Call: The Heroic Story of WWI Telephone Operators. First edition. Calkins Creek, an imprint of Boyds Mills & Kane, 2021.
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