United States. Department of Labor Bureau of Labor Statistics. (1988). Supplement to employment and earnings. U.S. Department of Labor.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Department of Labor Bureau of Labor Statistics. Supplement to Employment and Earnings. U.S: U.S. Department of Labor, 1988.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited States. Department of Labor Bureau of Labor Statistics. Supplement to Employment and Earnings. U.S. Department of Labor, 1988.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.