12. [i.e. Douzième] Congrès :
Rapports. Papers. Abhandlungen.
APA Citation
International Union of Forestry Research Organizations. (1958). 12. [i.e. Douzième] Congrès: Rapports. Papers. Abhandlungen. London.
MLA Citation
International Union of Forestry Research Organizations. 12. [i.e. Douzième] Congrès: Rapports. Papers. Abhandlungen. London, 1958.
Warning: These citations may not always be complete (especially for serials).