National Association of Secondary School Principals (U.S.). (1981). Schools in the middle. The Association.
Цитирование в стиле Чикаго (17-е изд.)National Association of Secondary School Principals (U.S.). Schools in the Middle. Reston, Va.: The Association, 1981.
Цитирование MLA (9-е изд.)National Association of Secondary School Principals (U.S.). Schools in the Middle. The Association, 1981.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.