Não informado. (2018). Research Circular. Pennsylvania Department of Forests and Waters.
Chicago-Zitierstil (17. Ausg.)Não informado. Research Circular. Harrisburg, Pa: Pennsylvania Department of Forests and Waters, 2018.
MLA-Zitierstil (8. Ausg.)Não informado. Research Circular. Pennsylvania Department of Forests and Waters, 2018.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.