Knowles, Caroline, author
Sage, 2003
Buku Teks
Strauss, Anselm L., author
Cambrigde University Press, 1987
Buku Teks
Knoke, David, author
Thomson, 2002
Buku Teks
Dobelstein, Andrew W., author
Wadsworth, 2003
Buku Teks
Dobelstein, Andrew W., author
Thomson Brooks/Cole, 2003
Buku Teks