Abulafia, D. (1993). Federico 2.: Un imperatore medievale. Einaudi.
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芝加哥风格引文
Abulafia, David. Federico 2.: Un Imperatore Medievale. Torino: Einaudi, 1993.
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MLA引文
Abulafia, David. Federico 2.: Un Imperatore Medievale. Einaudi, 1993.
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警告：这些引文格式不一定是100％准确.