Brown, Robert R.
Aldine Pub. Co., 1963
Buku Teks
Blalock, Hubert M., author
Sage Publications, 1982
Buku Teks
Williams, Malcolm, 1953-, author
Routledge, 2000
Buku Teks
Simon, Julian L., author
Random House, 1978
Buku Teks
Berg, Bruce L. (Bruce Lawrence), 1954-, author
Pearson, 2004
Buku Teks