APA-referens (7:e uppl.)

Não informado. (1966). Resource Bulletin NC. North Central Forest Experiment Station, Forest Service.

Chicago-referens (17:e uppl.)

Não informado. Resource Bulletin NC. Saint Paul, Minn: North Central Forest Experiment Station, Forest Service, 1966.

MLA-referens (8:e uppl.)

Não informado. Resource Bulletin NC. North Central Forest Experiment Station, Forest Service, 1966.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.