Não informado. (1987). Norwegian Journal of Agricultural Sciences. Norwegian Agricultural Advisory Centre.
Chicago-referens (17:e uppl.)Não informado. Norwegian Journal of Agricultural Sciences. As, Noruega: Norwegian Agricultural Advisory Centre, 1987.
MLA-referens (8:e uppl.)Não informado. Norwegian Journal of Agricultural Sciences. Norwegian Agricultural Advisory Centre, 1987.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.
