edited by Colin Harris
Taylor Graham, 1987
Buku Teks
BPP Publishing, 1992
Buku Teks SO
edited by Irene Wormell
Taylor Graham , 1987
Buku Teks
Cortoda, James W.
New York McGraw-Hill 1996,
Buku Teks
edited by William B. Frakes
Pretice-Hall , 1992
Buku Teks SO