Percentage Distribution of 6- to 12-year-olds, 1972-97. US Department of Education.
Цитирование в стиле Чикаго (17-е изд.)Percentage Distribution of 6- to 12-year-olds, 1972-97. US Department of Education.
Цитирование MLA (9-е изд.)Percentage Distribution of 6- to 12-year-olds, 1972-97. US Department of Education.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.