Portner, J. (2010). Besser verhandeln: Das Trainingsbuch. GABAL.
Chicago Style (17th ed.) CitationPortner, Jutta. Besser Verhandeln: Das Trainingsbuch. Offenbach: GABAL, 2010.
MLA (9th ed.) CitationPortner, Jutta. Besser Verhandeln: Das Trainingsbuch. GABAL, 2010.
Warning: These citations may not always be 100% accurate.