1. Brodkey, L. (1986). Tropics of literacy.Journal of Education 168: 47?54.
2. Chall, J., Heron, E., and Hilferty, A. (1987). Adult literacy: New and enduring problems.Phi Delta Kappan 34: 190?196.
3. Diekhoff, G. M., and Diekhoff, K. B. (1984). The adult literacy program attrition problem: Identification at intake.Adult Literacy and Basic Education 50: 415?424.
4. Fingeret, A. (1988).The Politics of Adult Literacy Education (Report No. CS 009 056). Washington, DC: National Urban Literacy Conference (January 22, 1988) (ERIC Document Reproduction Service No. ED 292 053).
5. Glaser, B. G. (1965). Constant comparative method of analysis.Social Problems 12: 436?445.