Gershevsky, R. H. (1959). PNLA 1909-1959: A chronological summary of fifty eventful years. Pacific Northwest Library Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGershevsky, Ruth Hale. PNLA 1909-1959: A Chronological Summary of Fifty Eventful Years. [Seattle?]: Pacific Northwest Library Association, 1959.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGershevsky, Ruth Hale. PNLA 1909-1959: A Chronological Summary of Fifty Eventful Years. Pacific Northwest Library Association, 1959.
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