Czeslaw Niewadzi

title	ISBN-13 (ISBN-10)	year of publication
Sektor uslug w kapitalizmie	978-83-01-03242-5 (83-01-03242-1)	1982
Zagadnienia uslug w teorii ekonomii	978-83-01-01019-5 (83-01-01019-3)	1979