Helle, H. J. (2012). Messages from Georg Simmel. Brill.
Tohutoru Kātū Chicago (17th ed.)Helle, Horst Jürgen. Messages from Georg Simmel. Leiden ; Boston: Brill, 2012.
Tohutoro MLA (9th ed.)Helle, Horst Jürgen. Messages from Georg Simmel. Brill, 2012.
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