Não informado. (2001). Shell aviation news. Shell International Trading.
Chicagoスタイル(17版)引用形式Não informado. Shell Aviation News. London: Shell International Trading, 2001.
MLA(8版)引用形式Não informado. Shell Aviation News. Shell International Trading, 2001.
警告: この引用は必ずしも正確ではありません.