Homo Novus - A Human Without Illusions Editat de Ulrich J. Frey et al. 14 sep 2010 Hardback Preț: 512.86 lei 43-57 zile
Essential Building Blocks of Human Nature Editat de Ulrich J. Frey et al. 26 apr 2011 Hardback Preț: 396.49 lei 38-44 zile