Não informado. (1971). Forestry Research Newsletter. Great Lakes Forest Research Centre.
Chicago (17e ed.) BronvermeldingNão informado. Forestry Research Newsletter. Sault Ste. Marie, Canada: Great Lakes Forest Research Centre, 1971.
MLA (8e ed.) BronvermeldingNão informado. Forestry Research Newsletter. Great Lakes Forest Research Centre, 1971.
Let op: Deze citaties zijn niet altijd 100% accuraat.