[November 4, 2007]. (原始内容存档于October 22, 2007). Paull, John (2013) "The RachelCarson Letters and the Making of Silent Spring" 互联网档案馆的存檔,存档日期2013-11-03.,
October 18, 2010. "Department of Conservation and Natural Resources RachelCarson State Office Building PO Box 8767 400 Market Street Harrisburg, PA 17105-8767