Não informado. (1930). BTH activities. Associated Electrical Industries.
Chicagoスタイル(17版)引用形式Não informado. BTH Activities. Rugby, Inglaterra: Associated Electrical Industries, 1930.
MLA(8版)引用形式Não informado. BTH Activities. Associated Electrical Industries, 1930.
警告: この引用は必ずしも正確ではありません.