Não informado. (2000). Technical bulletin. Institute for Land and Water Management Research.
Chicago-referens (17:e uppl.)Não informado. Technical Bulletin. Wageningen, Holanda: Institute for Land and Water Management Research, 2000.
MLA-referens (8:e uppl.)Não informado. Technical Bulletin. Institute for Land and Water Management Research, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.