APA
Hardi P., Weidenfeld W., . (1994). Environmental protection in East-Central Europe: a market-oriented approach. Gütersloh: Bertelsmann Foundation Publishers.
Chicago
Hardi Péter, Weidenfeld Werner, . 1994. Environmental protection in East-Central Europe: a market-oriented approach. Gütersloh: Bertelsmann Foundation Publishers.
Harvard
Hardi P., Weidenfeld W., . (1994). Environmental protection in East-Central Europe: a market-oriented approach. Gütersloh: Bertelsmann Foundation Publishers.
MLA
Hardi Péter, Weidenfeld Werner, . Environmental protection in East-Central Europe: a market-oriented approach. Gütersloh: Bertelsmann Foundation Publishers. 1994.