Weil, Edward D.; Sandler, Stanley R. "Sulfur Compounds". In Kroschwitz, Jacqueline I. Kirk-Othmer Concise Encyclopedia of Chemical Technology (4th ed.). New York: John Wiley & Sons, Inc., 1999.

Weil, Edward D.; Sandler, Stanley R. "Sulfur Compounds". In Kroschwitz, Jacqueline I. Kirk-Othmer Concise Encyclopedia of Chemical Technology (4th ed.). New York: John Wiley & Sons, Inc., 1999.