APA (7 वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, Heidar, K., & Koole, R. A. (2000). Parliamentary party groups in European democracies: Political parties behind closed doors. Routledge.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, Knut Heidar, और R. A. Koole. Parliamentary Party Groups in European Democracies: Political Parties Behind Closed Doors. London ; New York: Routledge, 2000.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, et al. Parliamentary Party Groups in European Democracies: Political Parties Behind Closed Doors. Routledge, 2000.
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