6Laura Kramer, The Sociology of Gender, New York.St. Martins Press, 1993.
7Marjan Wijers & Lin Lap-Chew , Trafficking in Women Force Labour and Slavery Like Practices in Marriage Domestic Labour and Prostitution, Foundation Against Trafficking in Women (STV), Netherland 1997.
8Margaret L. Andersen & Patricia Hill Collins , Race,Class and Gender An Anthology, Wadsworth Publishing Company, Belmont etc. , 1998.