Duignan, B. (2010). The executive branch of the federal government: Purpose, process, and people. Britannica Educational Pub., in association with Rosen Educational Services.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDuignan, Brian. The Executive Branch of the Federal Government: Purpose, Process, and People. New York: Britannica Educational Pub., in association with Rosen Educational Services, 2010.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDuignan, Brian. The Executive Branch of the Federal Government: Purpose, Process, and People. Britannica Educational Pub., in association with Rosen Educational Services, 2010.
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