Keith, N. W., & Keith, N. Z. (1988). New perspectives on social class and socioeconomic development in the periphery. Greenwood Press.

Keith, Nelson W., and Novella Zett Keith. New Perspectives on Social Class and Socioeconomic Development in the Periphery. New York: Greenwood Press, 1988.

Keith, Nelson W., and Novella Zett Keith. New Perspectives on Social Class and Socioeconomic Development in the Periphery. Greenwood Press, 1988.