APA (7th ed.) Citation

National Association of Secondary School Principals (U.S.). (1981). Schools in the middle. The Association.

Chicago Style (17th ed.) Citation

National Association of Secondary School Principals (U.S.). Schools in the Middle. Reston, Va.: The Association, 1981.

MLA (9th ed.) Citation

National Association of Secondary School Principals (U.S.). Schools in the Middle. The Association, 1981.