“The European Parliament’s Political Groups in Turbulent Times is the most recent work in the emerging studies of the European Parliament (EP) under the pressure of the post-2008 decade of crises. … as acknowledged by Ahrens, Elomäki and Kantola, all chapters could be expanded into new research with further empirical data. … The authors seem to be in a particularly good position to go in-depth with such a matter.” (Catarina Silva, Journal of Contemporary European Studies, February 15, 2023)“Ahrens et al.’s volume paints a complete picture by accounting also for the informal nature of EP politics. … The chapters in this book demonstrate the importance of informal interactions, networking and norms of procedure inside and between groups to capturefully what goes on inside the EP. … Ahrens et al.’s book is ultimately more than a study of EP institutional processes and politics. … The book covers new ground also concerning the activities of Eurosceptics, especially on the right.” (Angelos Chryssogelos, Journal of European Integration, March 27, 2022)