Lay, W. (1899). Methodik des naturgeschichtlichen Unterrichts.
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Chicago Style (17th ed.) Citation
Lay, W.A. Methodik Des Naturgeschichtlichen Unterrichts. Karlsruhe, 1899.
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MLA引文
Lay, W.A. Methodik Des Naturgeschichtlichen Unterrichts. 1899.
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警告：這些引文格式不一定是100％准確.