Book Review: Constitutional Sovereignty and Social Solidarity in Europe, edited by Johan van der Walt and Jeffrey Ellsworth. (Baden-Baden: Nomos, 2015) - Common Market Law Review View Book Review: Constitutional Sovereignty and Social Solidarity in Europe, edited by Johan van der Walt and Jeffrey Ellsworth. (Baden-Baden: Nomos, 2015) by - Common Market Law Review Book Review: Constitutional Sovereignty and Social Solidarity in Europe, edited by Johan van der Walt and Jeffrey Ellsworth. (Baden-Baden: Nomos, 2015) 53 1 Common Market Law Review