Schulz Friedemann

title	ISBN-13 (ISBN-10)	year of publica- tion	other author(s)
Sztuka wyjasniania	978-83-7318-243-1 (83-7318-243-8)	2004	Christoph Thomann
Sztuka zarzadzania	978-83-7318-120-5 (83-7318-120-2)	2004	Johannes Ruppel · Roswitha Stratmann