Oberheide, W. (1927). Die niedersächsische Portlandzement-Industrie.
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Chicago Style (17th ed.) Citation
Oberheide, Wilhelm. Die Niedersächsische Portlandzement-Industrie. 1927.
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MLA引文
Oberheide, Wilhelm. Die Niedersächsische Portlandzement-Industrie. 1927.
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警告：這些引文格式不一定是100％准確.