Wolf, Paul R.
Gadja Mada University Press, 1993
Buku Teks
Rampal, K.K.
Oxford & IBH, 1982
Buku Teks
Ghosh, Sanjib K.
Ohio The Ohia State University, 1968
Buku Teks
Sharp, H. Oakley
Macmillan, 1951
Buku Teks
Wolf, Paul R.
McGraw-Hill Kogakusha, 1974
Buku Teks