APA (7e ed.) Bronvermelding

Não informado. US Forest Service Research Note PNW. U.S. Forest Service.

Chicago (17e ed.) Bronvermelding

Não informado. US Forest Service Research Note PNW. Portland, Ore: U.S. Forest Service.

MLA (8e ed.) Bronvermelding

Não informado. US Forest Service Research Note PNW. U.S. Forest Service.

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