Beverly Hills Sage Publications 1985 .
231 p. , Based on papers presented at a conference held at the University of Kansas in November 1983.

Thousand Oaks Sage Publications 1994 .
xii, 643 p. 26 cm..
0803946791 (cloth)

By Guba, Egon G..
San Francisco : Jossey-Bass Publishers, 1981 .
xxi, 423 p. : 24 cm..
0875894933

Thousand Oaks : Sage, 2011 .
xvi, 766 p. : 29 cm..
9781412974172 (cloth)