Não informado. (1999). Shools in the middle. National Association of Secondary School Principals.
Citação do estilo Chicago (17ª ed.)Não informado. Shools in the Middle. Reston, Va: National Association of Secondary School Principals, 1999.
Citação MLA (8ª ed.)Não informado. Shools in the Middle. National Association of Secondary School Principals, 1999.
警告：这些引文格式不一定是100％准确.