See his On Individuality and Social Forms: Selected Writings, ed. and with an introd. by D. N. Levine (1971); biography by D. Frisby (1984); essays by and about Simmel, edited by K. H. Wolff (1965); studies by N. J. Spykman (1925, repr. 1964), L. A. Coser (1965), and D. Frisby (1981).
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