Hogan, C. Michael. Sulfur. A.Jorgensen; C.J.Cleveland (编). Encyclopedia of Earth. Washington DC (USA): National Council for Science and the environment. 2011 [2022-03-07]. (原始内容存档于2012-10-28) (英语).
Hogan, C. Michael. Sulfur. A.Jorgensen; C.J.Cleveland (编). Encyclopedia of Earth. Washington DC (USA): National Council for Science and the environment. 2011 [2022-03-07]. (原始内容存档于2012-10-28) (英语).