Barker, T. C. (1960). Pilkington brothers and the glass industry. London: Allen & Unwin.
Čikaški stil citiranjaBarker, Theodore Cardwell. Pilkington Brothers and the Glass Industry. London: Allen & Unwin, 1960.
MLA način citiranjaBarker, Theodore Cardwell. Pilkington Brothers and the Glass Industry. London: Allen & Unwin, 1960.
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