ebrary, Inc, Leigh, R. B., & Liu, C. A. (2011). Hungarian problem book IV. Mathematical Association of America.
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芝加哥风格引文
ebrary, Inc, Robert Barrington Leigh, 与 Chiang-Fung Andrew Liu. Hungarian Problem Book IV. [Washington, D.C.]: Mathematical Association of America, 2011.
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MLA引文
ebrary, Inc, et al. Hungarian Problem Book IV. Mathematical Association of America, 2011.
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警告：这些引文格式不一定是100％准确.