Gore, M.S., author
Asia Publishing House, 1965
Buku Teks
Cohen, Nathan Edward, author
National Ass. of Workker, 1964
Buku Teks
Halm, George N., author
Blakiston, 1948
Buku Teks
Merton, Robert K., author
Free Press, 1957
Buku Teks
Merton, Robert K., author
Free Press, 1968
Buku Teks