Bechhofer, Frank, author
Routledge, 2000
Buku Teks
Stebbins, Robert A., author
Sage, 2001
Buku Teks
edited, Bridget Somekh, Cathy Lewin
Sage Publications , 2005
Buku Teks
Berg, Bruce L. (Bruce Lawrence), 1954-, author
Pearson, 2014
Buku Teks
Berg, Bruce L. (Bruce Lawrence), 1954-, author
Pearson, 2004
Buku Teks