APA (7e ed.) Bronvermelding

Não informado. (1966). Research Paper NC. North Central Forest Experiment Station.

Chicago (17e ed.) Bronvermelding

Não informado. Research Paper NC. Saint Paul, Minn: North Central Forest Experiment Station, 1966.

MLA (8e ed.) Bronvermelding

Não informado. Research Paper NC. North Central Forest Experiment Station, 1966.

Let op: Deze citaties zijn niet altijd 100% accuraat.