Aswad Dipo, author
1971
UI - Skripsi (Membership)
Arnold, William R., author
Houghton Mifflin, 1983
Buku Teks
Cambridge University Press, 1996
Buku Teks
Trojanowicz, Robert C., 1941-, author
Prentice-Hall, 1987
Buku Teks
Shaw, Clifford R.
University of Chicago, 1969
Buku Teks