Não informado. (2019). Newsletter. Pennsylvania State University, Environmental Resources Research Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Newsletter. University Park, Pa: Pennsylvania State University, Environmental Resources Research Institute, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Newsletter. Pennsylvania State University, Environmental Resources Research Institute, 2019.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.