National Association of Independent Schools. Independent school. [National Association of Independent Schools].
Citazione stile Chigago Style (17a edizione)National Association of Independent Schools. Independent School. [Boston]: [National Association of Independent Schools].
Citatione MLA (9a ed.)National Association of Independent Schools. Independent School. [National Association of Independent Schools].
Attenzione: Queste citazioni potrebbero non essere precise al 100%.