Elliott, Roger J., author
English Language Book Society, 1978
Buku Teks
Academic Press, 1984
Buku Teks
Verma, Ajit Ram
Wiley Eastren, 1982
Buku Teks
Omar, M. Ali, author
Addison-Wesley, 1975
Buku Teks
Dalven, Richard, author
Plenum Press, 1990
Buku Teks