Gruber, M. (1995). Understanding sql. BPB Pub.
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芝加哥风格引文
Gruber, Martin. Understanding Sql. New Delhi: BPB Pub, 1995.
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MLA引文
Gruber, Martin. Understanding Sql. BPB Pub, 1995.
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警告：这些引文格式不一定是100％准确.