International Federation for Housing and Planning. (1971). Environment and physical planning, background papers for a discussion group at the International Congress of IFHP held at Belgrade, Yugoslavia in June 1971. International Federation for Housing and Planning.
Chicago-viite (17. p.)International Federation for Housing and Planning. Environment and Physical Planning, Background Papers for a Discussion Group at the International Congress of IFHP Held at Belgrade, Yugoslavia in June 1971. The Hague: International Federation for Housing and Planning, 1971.
MLA-viite (9. p.)International Federation for Housing and Planning. Environment and Physical Planning, Background Papers for a Discussion Group at the International Congress of IFHP Held at Belgrade, Yugoslavia in June 1971. International Federation for Housing and Planning, 1971.