Pillar, Paul R.
Princeton University Press , 1983
Buku Teks
Oxley, Harold
Gunung Mulia, 1993
Buku Teks
Springer, 2007
Buku Teks
Sills, Theodore R
Richard D.Irwin,Inc, 1951
Buku Teks
Curtin, Patricia A. (Patricia Ann), 1955-, author
Sage Publications, 2007
Buku Teks