Chipperfield, R. O. (192). Ethel opens the door: An exploit of the Shadowers. Hurst and Blackett.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChipperfield, Robert Orr. Ethel Opens the Door: An Exploit of the Shadowers. London: Hurst and Blackett, 192.
एमएलए (9वां संस्करण) प्रशस्ति पत्रChipperfield, Robert Orr. Ethel Opens the Door: An Exploit of the Shadowers. Hurst and Blackett, 192.
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