HAMMER, W. (1989). Occupational safety management and engineering (Ed.4.). Prentice Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHAMMER, Willie. Occupational Safety Management and Engineering. Ed.4. New Jersey: Prentice Hall, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHAMMER, Willie. Occupational Safety Management and Engineering. Ed.4. Prentice Hall, 1989.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.