Survey of Current Business. Superintendent of Documents.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSurvey of Current Business. Superintendent of Documents.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSurvey of Current Business. Superintendent of Documents.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.