Sitter, C. L. (1992). The vertical file and its alternatives: A handbook. Libraries Unlimited.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSitter, Clara Loewen. The Vertical File and Its Alternatives: A Handbook. Englewood, Colo.: Libraries Unlimited, 1992.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSitter, Clara Loewen. The Vertical File and Its Alternatives: A Handbook. Libraries Unlimited, 1992.
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