Não informado. (2019). Newsletter. Pennsylvania State University, Environmental Resources Research Institute.
Chicago-Zitierstil (17. Ausg.)Não informado. Newsletter. University Park, Pa: Pennsylvania State University, Environmental Resources Research Institute, 2019.
MLA-Zitierstil (8. Ausg.)Não informado. Newsletter. Pennsylvania State University, Environmental Resources Research Institute, 2019.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.