APA
Hitchens D. M. (., Fichter K. (. & Clausen J. (. (1999). International environmental management benchmarks: Best prac. Berlin: Springer-Verlag.
Chicago
Hitchens David M.W.N (ed), Fichter Klaus (ed) and Clausen Jens (ed). 1999. International environmental management benchmarks: Best prac. Berlin: Springer-Verlag.
Harvard
Hitchens D. M. (., Fichter K. (. and Clausen J. (. (1999). International environmental management benchmarks: Best prac. Berlin: Springer-Verlag.
MLA
Hitchens David M.W.N (ed), Fichter Klaus (ed) and Clausen Jens (ed). International environmental management benchmarks: Best prac. Berlin: Springer-Verlag. 1999.