, « Ambiguous individuality: Georg Simmel on the "who" and the "what" of the individual », Human Studies, 31 (3), 2008, pp. 279-298. https://doi.org/10.1007/s10746-008-9096-7.
, Simmel and "the social", Basingstoke, Palgrave Macmillan, 2010.
, « Triangular relations », in F. Dépelteau (ed.), The Palgrave handbook of relational sociology, Basingstoke, Palgrave Macmillan, 2018, pp. 161-182.