Não informado. (1961). Building Materials. Leonard Hill Technical Group.
Chicagoスタイル(17版)引用形式Não informado. Building Materials. London: Leonard Hill Technical Group, 1961.
MLA(8版)引用形式Não informado. Building Materials. Leonard Hill Technical Group, 1961.
警告: この引用は必ずしも正確ではありません.