United States. Bureau of the Budget & Office of Statistical Standards. Statistical services of the United States Government (Rev. ed.). U.S. Govt. Print. Off.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Bureau of the Budget और Office of Statistical Standards. Statistical Services of the United States Government. Rev. ed. [Washington: U.S. Govt. Print. Off.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited States. Bureau of the Budget और Office of Statistical Standards. Statistical Services of the United States Government. Rev. ed. U.S. Govt. Print. Off.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.