edited by Norman K. Denzin, Yvonna S. Lincoln
Sage, 1998
Buku Teks SO
Marshall, Catherine
Sage, 1999
Buku Teks SO
Berg, Bruce Lawrence, 1954-
Allyn and Bacon, 1989
Buku Teks
Berg, Bruce Lawrence, 1954-
Pearson, 2014
Buku Teks SO
Tashakkori, Abbas
Sage, 1998
Buku Teks SO