8Blishen, B, R. 1958, "The Construction and Use of an Occupational Class Scale." Canadian Journal of Evonomics and Political Science 24.
9Bian, Yanjie 1994, Work and Inequality in Urban China,Albany: State University of New York Press.
10Duncan, O. D. 1961, "A Socio-eeonomic Index for all Occupations. " and "Properties and Characteristics of the Socioeconomic Index."in A. J. Reiss(ed. ), Occupations and Social Status, Glencoe, IL:Free Press.