Não informado. (1972). Shell in agriculture. Shell International Chemical Company.
Chicagoスタイル(17版)引用形式Não informado. Shell in Agriculture. London: Shell International Chemical Company, 1972.
MLA(8版)引用形式Não informado. Shell in Agriculture. Shell International Chemical Company, 1972.
警告: この引用は必ずしも正確ではありません.