1. Act of 29 August 1997 on Court Bailiffs and Executions (Ustawa z dnia 29 sierpnia, 1997 r. o komornikach sądowych i egzekucji) (in original language).
2. Act of 29 August 1997 on Covered Bonds and Mortgage Banks (Ustawa z dnia 29 sierpnia 1997 r. o listach zastawnych i bankach hipotecznych) (in original language).
3. The appraisal of real estate, Third Canadian edition;Babineau;Canadian Property Valuation. Winnipeg,2010
4. The Ordinary Business of Life;Backhouse,2002
5. Rough sets in the soft computing environment;Bello;Inform. Sci.,2012