APA
Committee of European Environmental Engineering Societies, . (1999). CEEES publication. Pfinztal: GUS.
Chicago
Committee of European Environmental Engineering Societies, . 1999. CEEES publication. Pfinztal: GUS.
Harvard
Committee of European Environmental Engineering Societies, . (1999). CEEES publication. Pfinztal: GUS.
MLA
Committee of European Environmental Engineering Societies, . CEEES publication. Pfinztal: GUS. 1999.