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.
警告：这些引文格式不一定是100％准确.