United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989: Class J Political science. Gale Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class J Political Science. Detroit: Gale Research, 1990.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class J Political Science. Gale Research, 1990.
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