Atoji, Yoshio1986. Georg Simmel's Sociological Horizons. Tokyo.
2.
Bulmer, Martin1984. The Chicago School of Sociology. Chicago .
3.
Caplow, Theodore1969. Two Against One Coalition in Triads. Englewood Cliffs, NJ
4.
Coser, Lewis A.1977. Masters of Sociological Thought ( 1971), 2nd ed. New York (in particular pp 176-215).
5.
Dilthey, Wilhelm1883. Einleitung in die Geisteswissenschaften, Bd 1. Leipzig.
6.
Gassen, Kurt & Landmann, Michael (eds.) 1958. Buch des Dankes an Georg Simmel. Briefe, Erinnerungen, Bibliographie. Berlin
7.
Helle, Horst Jurgen1986. Dilthey, Simmel und VerstehenFrankfurt a.M.
8.
Lachaud, Jean-Marc1984. Georg Simmel. In Denis Huisman (ed.), Dictionnaire des philosophesParis.
9.
Levine, Donald N.1980. Simmel and Parsons: Two Approaches to the Study of Society (1957). New York.
10.
Schnabel, Peter-Ernst1976. Georg Simmel. In Dirk Kasler (ed. ), Klassiker des soziologischen Denkens Bd. 1. Munchen.
11.
Simmel, Georg1931. Soziologische Vorlesungen ... gehalten an der Universitat Berlin im Wintersemester 1899. Society for Social Research, Univ. of Chicago, Series 1, Number 1 (a mimeographed reproduction of Park's notes, published by his pupils).
12.
Weber, Max1972. Georg Simmel as Sociologist. Introd. by Donald N. Levine. Social Research39, 155-163.
13.
v. Wiese, Leopold1924. System der allgemeinen Soziologie. Munchen, Leipzig, 1924-29.