APA (7e ed.) Bronvermelding

Unknown. (2023). Pennsylvania department of forestry. Forest Research Institute.

Chicago (17e ed.) Bronvermelding

Unknown. Pennsylvania Department of Forestry. Forest Research Institute, 2023.

MLA (9e ed.) Bronvermelding

Unknown. Pennsylvania Department of Forestry. Forest Research Institute, 2023.

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