Hula, K. W. (1999). Lobbying together: Interest group coalitions in legislative politics. Georgetown University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHula, Kevin W. Lobbying Together: Interest Group Coalitions in Legislative Politics. Washington, DC: Georgetown University Press, 1999.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHula, Kevin W. Lobbying Together: Interest Group Coalitions in Legislative Politics. Georgetown University Press, 1999.
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