Percentage Distribution of 6- to 12-year-olds, 1972-97. US Department of Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPercentage Distribution of 6- to 12-year-olds, 1972-97. US Department of Education.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPercentage Distribution of 6- to 12-year-olds, 1972-97. US Department of Education.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.