Não informado. (2016). Bi-Monthly Research Notes. Environment Canada, Forestry Service.
Chicago-referens (17:e uppl.)Não informado. Bi-Monthly Research Notes. Ottawa: Environment Canada, Forestry Service, 2016.
MLA-referens (8:e uppl.)Não informado. Bi-Monthly Research Notes. Environment Canada, Forestry Service, 2016.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.