Greenberg, Joseph H. (Joseph Harold), 1915-2001, author
Mounton, 1976
Buku Teks
Chesterman, Andrew, author
Cambridge University Press, 1991
Buku Teks
Batten,T.R., author
Oxford University Press, 1960
Buku Teks
Nowak, Norman D., author
Praeger, 1970
Buku Teks
Sie, Kwat Soen
Centre for Agricultural Publications and Documentation, 1968
Buku Teks