Não informado. (2008). School bell. National School Public Relations Association.
Chicagoスタイル(17版)引用形式Não informado. School Bell. Washington: National School Public Relations Association, 2008.
MLA(8版)引用形式Não informado. School Bell. National School Public Relations Association, 2008.
警告: この引用は必ずしも正確ではありません.