APA (7e ed.) Bronvermelding

Não informado. (2019). Newsletter. Pennsylvania State University, Environmental Resources Research Institute.

Chicago (17e ed.) Bronvermelding

Não informado. Newsletter. University Park, Pa: Pennsylvania State University, Environmental Resources Research Institute, 2019.

MLA (8e ed.) Bronvermelding

Não informado. Newsletter. Pennsylvania State University, Environmental Resources Research Institute, 2019.

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