APA
Bergesen O. H. (., Tommessen O. B. (. & Parmann G. (. (1998). Yearbook of international co-operation on environment and de. London: Earthscan.
Chicago
Bergesen Ole Helge (ed), Tommessen Oystein B (ed) and Parmann Georg (ed). 1998. Yearbook of international co-operation on environment and de. London: Earthscan.
Harvard
Bergesen O. H. (., Tommessen O. B. (. and Parmann G. (. (1998). Yearbook of international co-operation on environment and de. London: Earthscan.
MLA
Bergesen Ole Helge (ed), Tommessen Oystein B (ed) and Parmann Georg (ed). Yearbook of international co-operation on environment and de. London: Earthscan. 1998.