Heckmann, O., & Haffner, H. (1935). Photographisch-photometrische Untersuchungen der Praesepe.
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芝加哥风格引文
Heckmann, Otto, 与 Hans Haffner. Photographisch-photometrische Untersuchungen Der Praesepe. 1935.
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MLA引文
Heckmann, Otto, 与 Hans Haffner. Photographisch-photometrische Untersuchungen Der Praesepe. 1935.
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警告：这些引文格式不一定是100％准确.