Não informado. (2019). Newsletter. Pennsylvania State University, Environmental Resources Research Institute.
Citação do estilo Chicago (17ª ed.)Não informado. Newsletter. University Park, Pa: Pennsylvania State University, Environmental Resources Research Institute, 2019.
Citação MLA (8ª ed.)Não informado. Newsletter. Pennsylvania State University, Environmental Resources Research Institute, 2019.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.