90 World-class activities by world-class trainers

Pfeiffer annual 2004 consulting

Pfeiffer annual 2004 training

Pfeiffer annual 2006 consulting

Pfeiffer annual 2006 training

The 2000 annual vol.1: training

The 2000 annual vol.2: consulting

The 2001 annual vol.1 :training

The 2001 annual vol.2: consulting

The 2002 annual 2 vols. (v1: training ; v2: consulting)