Wittchen, M., Krimmel, A., Kohler, M. & Hertel, G. (in press). The two sides of competition: Competition-induced effort and affect during intergroup vs. interindividual competition. British Journal of Psychology.

Wittchen, M., van Dick, R., & Hertel, G. (2011). Intergroup competition as a trigger of motivation gains in groups: A review and process analysis. Organisational Psychology Review, 1(3), 257-272.

Wittchen, M., Kleinlein, N. & Hertel, G. (2011). Zielvereinbarungen und Kommunikationsmanagement als komplementäre Führungsstrategien in virtuellen Teams. Wirtschaftspsychologie (3), Themenheft 'Kooperation im virtuellen und globalem Kontext'.

Wittchen, M. & Hertel, G. (2009), Making promises can compensate for distance: self-commitment effects in computer-supported teams. Manuskript akzeptiert für das Annual Meeting of the Society for Industrial and Organizational Psychology (SIOP) 2009 in New Orleans, USA.

Wittchen, M. & Hertel, G. (2007). Effects of commitment and communication media on trust and motivation. Manuskript akzeptiert für das Annual Meeting of the Society for Industrial and Organizational Psychology (SIOP) 2007 in New York, USA. Ausgezeichnet mit dem SIOP-Posterpreis.

Wittchen, M. (2009). Effects of self-commitment on trust and motivation in computer-supported cooperative work. Tönning: DAV.

Weber, B., Wittchen, M. & Hertel, G. (2009). Gendered ways to motivation gains in groups. Sex Roles, 60, 731-744.

Hertel, G. & Wittchen, M. (2008). Work motivation. In N. Chmiel (Hrsg.), An Introduction to Work and Organizational Psychology (S. 29-55). Oxford: Blackwell.

Wittchen, M., Schlereth, D., & Hertel, G. (2007). Indispensability effects in spite of temporal and spatial separation: Motivation gains in a sequential task during anonymous cooperation on the Internet. International Journal of Internet Science, 2, 12-27.

Wittchen, M. & Hertel, G. (submitted). Effects of partner commitment and communication media on trust and motivation in work groups.