APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.