Não informado. (1991). PAIS International in Print. Public Affairs Information Service.
Chicagoスタイル(17版)引用形式Não informado. PAIS International in Print. New York: Public Affairs Information Service, 1991.
MLA(8版)引用形式Não informado. PAIS International in Print. Public Affairs Information Service, 1991.
警告: この引用は必ずしも正確ではありません.