Pieper, J. (1962). El ocio y la vida intelectual. Ediciones Rialp.
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芝加哥风格引文
Pieper, Josef. El Ocio Y La Vida Intelectual. Madrid: Ediciones Rialp, 1962.
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MLA引文
Pieper, Josef. El Ocio Y La Vida Intelectual. Ediciones Rialp, 1962.
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警告：这些引文格式不一定是100％准确.