1. Barton, A. H. and P. F. Lazarsfeld (1961) "Some functions of qualitative analysis in social research," pp. 95-112 in S. M. Lipset and N. J. Smelser (eds.) Sociology, The Progress of a Decade. Englewood Cliffs, NJ: Prentice-Hall.
2. ——— and B. Geer (1960) " Participant observation: The analysis of qualitative field data," pp. 267-289 in R. N. Adams and J. J. Preis (eds.) Human Organizational Research. Homewood, IL: Dorsey.