Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.