Parwoll, M. & Wagner, R. (2011). Direct Marketing for Best-Agers: In Dialogue with Challenging Customers. In C. Bornemeyer & J. Schneider (ed.), Aging Society and its Implications on Service Marketing Approaches in the Hospitality, Tourism and Transport (pp. 19-40) . Bock .

Wagner, R. (2011). Neue Medien im Kundendialog -
n Überblick zu den Kommunikationsdiensten des Web 2.0. In W. Lietzau, J. Bender & T. Richter (ed.), Praxishandbuch Social Media in Verbänden Grundlagen - Praxiswissen - Fallbeispiele (pp. 90-104) . Deutsche Gesellschaft für Verbandsmanagement e.V. (DGVM) .

Wagner, R. (2011). Websites and Blogs. In Green Consumerism , Vol. 6 (pp. 460-465) . SAGE Publications .

Wagner, R. (2009). Best Buy. In C. Wankel (ed.), Encyclopedia of Business in Today's World (pp. 141-142) . Sage .

Wagner, R. (2009). Chicago School/Chicago Boys. In C. Wankel (ed.), Encyclopedia of Business in Today's World (pp. 260-262) . Sage .

Wagner, R. (2009). Competitive Advantages of Nations. In C. Wankel (ed.), Encyclopedia of Business in Today's World (pp. 357-358) . Sage .

Wagner, R. (2009). Industrial Espionage. In C. Wankel (ed.), Encyclopedia of Business in Today's World (pp. 859-863) . Sage .

Wagner, R. (2009). Market Imperfections Theory. In C. Wankel (ed.), Encyclopedia of Business in Today's World (pp. 1076-1077) . Sage .

Wagner, R. (2009). Service Level. In C. Wankel (ed.), Encyclopedia of Business in Today's World (pp. 1431-1433) . Sage .

Wagner, R. (2009). Wholesale Sector. In C. Wankel (ed.), Encyclopedia of Business in Today's World (pp. 1713-1714) . Sage .

Wagner, R. & Michaeli, R. (2009). Competitive Intelligence. In S. M. Litzcke & H. Müller-Enbergs (ed.), Sicherheit in Organisationen (pp. 13-31) . Verlag für Polizeiwissenschaft .

Meißner, M., Scholz, S. & Wagner, R. (2008). Marketing Research using Multimedia Technologies. In M. Pagani (ed.), Encyclopedia of Multimedia Technology and Networking (pp. 880 - 886) . IGI Global .

Meißner, M. & Wagner, R. (2008). Multimedia for Direct Marketing. In M. Pagani (ed.), Encyclopedia of Multimedia Technology and Networking (pp. 978 - 985) . IGI Global .

Scholz, S. & Wagner, R. (2008). Scanning Multimedia Business Environments. In M. Pagani (ed.), Encyclopedia of Multimedia Technology and Networking (pp. 1257 - 1263) . IGI Global .

Wagner, R. & Klaus, M. (2008). Cultural Impacts on the Spread of Mobile Commerce: An International Comparison. In B. Unhelkar (ed.), Handbook of Research on Mobile Business (pp. 245 - 259) . IGI .

Wagner, R. & Klaus, M. (2008). Mobile Direct Marketing. In B. Unhelkar (ed.), Handbook of Research on Mobile Business (pp. 269 - 281) . IGI .

Wagner, R. (2008). Customizing Multimedia with Multi-Trees. In M. Pagani (ed.), Encyclopedia of Multimedia Technology and Networking (pp. 318 - 323) . IGI Global .

Decker, R. & Wagner, R. (2007). Fehlende Werte: Ursachen, Konsequenzen und Behandlung. In A. Hermann, A. Herrmann & M. Klarmann (ed.), Handwörterbuch der Marktforschung (pp. 53 - 79) . Gabler .

Decker, R. & Wagner, R. (2006). Marketing. In F. G. Becker (ed.), Einführung in die Betriebswirtschaftslehre (pp. 163-199) . Springer .

Scholz, S. & Wagner, R. (2005). Autonomous Environmental Scanning in the World Wide Web (537). Fakultät für Wirtschaftswissenschaften .

Wagner, R., Scholz, S. & Decker, R. (2005). The Number of Clusters in Market Segmentation. In D. Baier, R. Decker & L. Schmidt-Thieme (ed.), Data Analysis and Decision Support (pp. 157 -- 176) . Springer .

Wagner, R. (2004). Kundenmanagement in wachsenden Märkten. In R. Decker & F. Wartenberg (ed.), Vertriebs- und Kundenmanagement: Marketingmethoden im Einsatz (pp. 231 -- 253) . Eul .

Decker, R. & Wagner, R. (2001). Assoziationsanalyse. In H. Diller (ed.), Vahlens großes Marketing-Lexikon (pp. 67) . Vahlen .

Decker, R. & Wagner, R. (2001). Data Mining. In H. Diller (ed.), Vahlens großes Marketing-Lexikon (pp. 255 - 258) . Vahlen .

Decker, R. & Wagner, R. (2001). Konkurrenzforschung (Competitive Intelligence). In H. Diller (ed.), Vahlens großes Marketing-Lexikon (pp. 805 - 808) . Vahlen .

Decker, R. & Wagner, R. (2001). Marketing-Informationsysteme (MAIS). In H. Diller (ed.), Vahlens großes Marketing-Lexikon (pp. 982 - 984) . Vahlen .

Decker, R., Wagner, R. & T., T. (1999). Fehlende Werte in der Marktforschung. In C. Homburg & A. Herrmann (ed.), Marktforschung: Methoden, Anwendungen, Praxisbeispiele (pp. 79 - 98) . Gabler .

Decker, R. & Wagner, R. (1999). Log-lineare Modelle und Logit. In C. Homburg & A. Herrmann (ed.), Marktforschung: Methoden, Anwendungen, Praxisbeispiele (pp. 549 - 578) . Gabler .