Negretti & Zambra Ltd. (1924). Industrial instruments. Negretti & Zambra Ltd..
芝加哥风格引文Negretti & Zambra Ltd. Industrial Instruments. London: Negretti & Zambra Ltd., 1924.
MLA引文Negretti & Zambra Ltd. Industrial Instruments. Negretti & Zambra Ltd., 1924.
警告：这些引文格式不一定是100％准确.