Watkins, Alan
Duckworth, 1991
Buku Teks
Pusat Pengkajian Kebijakan Teknologi Pengembangan Wllayah , 2003
Buku Teks
Mead, Margaret, author
A Mentor Book, 1960
Buku Teks
Benedict, Ruth, author
Cornell University, 1952
Buku Teks
Glenne, Michael
Roy Publishers, [date of publication not identified]
Buku Teks